Fix compilation error

Author: ipavlidakis

Sources/StreamVideo/WebRTC/v2/WebRTCAuthenticator.swift

@@ -88,13 +88,17 @@ struct WebRTCAuthenticator: WebRTCAuthenticating {
         /// - Finally, applies the determined call settings to the state adapter.
         let initialCallSettings = await coordinator.stateAdapter.initialCallSettings
         let remoteCallSettings = CallSettings(response.call.settings)
-        var callSettings = initialCallSettings ?? remoteCallSettings
-        if
-            coordinator.stateAdapter.audioSession.currentRoute.isExternal,
-            callSettings.speakerOn
-        {
-            callSettings = callSettings.withUpdatedSpeakerState(false)
-        }
+        let callSettings = {
+            var result = initialCallSettings ?? remoteCallSettings
+            if
+                coordinator.stateAdapter.audioSession.currentRoute.isExternal,
+                result.speakerOn
+            {
+                result = result.withUpdatedSpeakerState(false)
+            }
+            return result
+        }()
+
         await coordinator
             .stateAdapter
             .enqueueCallSettings { _ in callSettings }