Update UnityTile.cs to support unity 6.2

[cfirz]

Unity 6.2 fix for error: Texture must have width greater than 0

Related issue

Example: Closes #832. Relates to #832.

Description of changes

Your text here!

QA checklists

• Add relevant code comments. Every API class and method should have <summary> description as well as description of parameters.
• Add tests for new/changed/updated classes and methods!!!
• Check out conventions in CONTRIBUTING.md.
• Check out conventions in CODING-STYLE.md
• Update the changelog
• Update documentation.

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[cfirz]

this is a fix for unity 6.2 error:

Texture must have width greater than 0.
0x00007fff286b18ae (Unity) StackWalker::ShowCallstack
0x00007fff286c11b9 (Unity) PlatformStacktrace::GetStacktrace
0x00007fff2992e05e (Unity) Stacktrace::GetStacktrace
0x00007fff29f065df (Unity) DebugStringToFile
0x00007fff280cab91 (Unity) Texture2D::InitTexture
0x00007fff280407c9 (Unity) Texture2DScripting::Create
0x00007fff2771f959 (Unity) Texture2D_CUSTOM_Internal_CreateImpl
0x0000018d16122c86 (Mono JIT Code) (wrapper managed-to-native) UnityEngine.Texture2D:Internal_CreateImpl_Injected (UnityEngine.Texture2D,int,int,int,UnityEngine.Experimental.Rendering.GraphicsFormat,UnityEngine.TextureColorSpace,UnityEngine.Experimental.Rendering.TextureCreationFlags,intptr,bool,UnityEngine.Bindings.ManagedSpanWrapper&)
0x0000018d161229bb (Mono JIT Code) UnityEngine.Texture2D:Internal_CreateImpl (UnityEngine.Texture2D,int,int,int,UnityEngine.Experimental.Rendering.GraphicsFormat,UnityEngine.TextureColorSpace,UnityEngine.Experimental.Rendering.TextureCreationFlags,intptr,bool,string)
0x0000018d161224a3 (Mono JIT Code) UnityEngine.Texture2D:Internal_Create (UnityEngine.Texture2D,int,int,int,UnityEngine.Experimental.Rendering.GraphicsFormat,UnityEngine.TextureColorSpace,UnityEngine.Experimental.Rendering.TextureCreationFlags,intptr,bool,string)
0x0000018d1612047b (Mono JIT Code) UnityEngine.Texture2D:.ctor (int,int,UnityEngine.TextureFormat,int,bool,intptr,bool,UnityEngine.MipmapLimitDescriptor)
0x0000018d1611fdeb (Mono JIT Code) UnityEngine.Texture2D:.ctor (int,int,UnityEngine.TextureFormat,bool)
0x0000018d2d2f3973 (Mono JIT Code) Mapbox.Unity.MeshGeneration.Data.UnityTile:SetRasterData (byte[],bool,bool) (at E:/UnityProjects/GeekAdvisor/Assets/Mapbox/Unity/MeshGeneration/Data/UnityTile.cs:294)
0x0000018d2d2f34bb (Mono JIT Code) Mapbox.Unity.MeshGeneration.Factories.MapImageFactory:OnImageRecieved (Mapbox.Unity.MeshGeneration.Data.UnityTile,Mapbox.Map.RasterTile) (at E:/UnityProjects/GeekAdvisor/Assets/Mapbox/Unity/MeshGeneration/Factories/MapImageFactory.cs:71)
0x0000018d2d2f3115 (Mono JIT Code) (wrapper delegate-invoke) System.Action2<T1_REF, T2_REF>:invoke_void_T1_T2 (T1_REF,T2_REF) 0x0000018d2d2f28f1 (Mono JIT Code) ImageDataFetcher/<>c__DisplayClass2_0:<FetchData>b__0 () (at E:/UnityProjects/GeekAdvisor/Assets/Mapbox/Unity/MeshGeneration/Factories/ImageDataFetcher.cs:49) 0x0000018d2d2f2271 (Mono JIT Code) Mapbox.Map.Tile:HandleTileResponse (Mapbox.Platform.Response) (at E:/UnityProjects/GeekAdvisor/Assets/Mapbox/Core/mapbox-sdk-cs/Map/Tile.cs:244) 0x0000018d2d2daa10 (Mono JIT Code) Mapbox.Platform.Cache.CachingWebFileSource:Request (string,System.Action1<Mapbox.Platform.Response>,int,Mapbox.Map.CanonicalTileId,string) (at E:/UnityProjects/GeekAdvisor/Assets/Mapbox/Core/mapbox-sdk-cs/Platform/Cache/CachingWebFileSource.cs:166)
0x0000018d2d2d9afb (Mono JIT Code) Mapbox.Unity.MapboxAccess:Request (string,System.Action`1<Mapbox.Platform.Response>,int,Mapbox.Map.CanonicalTileId,string) (at E:/UnityProjects/GeekAdvisor/Assets/Mapbox/Unity/MapboxAccess.cs:234)
0x0000018d2d2d539d (Mono JIT Code) Mapbox.Map.Tile:Initialize (Mapbox.Platform.IFileSource,Mapbox.Map.CanonicalTileId,string,System.Action) (at E:/UnityProjects/GeekAdvisor/Assets/Mapbox/Core/mapbox-sdk-cs/Map/Tile.cs:144)
0x0000018d2d2d4b4b (Mono JIT Code) ImageDataFetcher:FetchData (DataFetcherParameters) (at E:/UnityProjects/GeekAdvisor/Assets/Mapbox/Unity/MeshGeneration/Factories/ImageDataFetcher.cs:35)
0x0000018d2d2d3b7b (Mono JIT Code) Mapbox.Unity.MeshGeneration.Factories.MapImageFactory:OnRegistered (Mapbox.Unity.MeshGeneration.Data.UnityTile) (at E:/UnityProjects/GeekAdvisor/Assets/Mapbox/Unity/MeshGeneration/Factories/MapImageFactory.cs:127)
0x0000018d2d2cbb38 (Mono JIT Code) Mapbox.Unity.MeshGeneration.Factories.AbstractTileFactory:Register (Mapbox.Unity.MeshGeneration.Data.UnityTile) (at E:/UnityProjects/GeekAdvisor/Assets/Mapbox/Unity/MeshGeneration/Factories/AbstractTileFactory.cs:71)
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