fix: prefer luasnip name over regex trigger in completion results

[yuukibarns]

blink.cmp had overcome the similar problems when dealing with regex trigger, solution is to prefer luasnip name over trigger when regTrig = true, which I find to be reasonable.

Demo:

Screencast_20250325_163313.webm

[L3MON4D3]

I think this is a good change, even for regular snippets: if there is a name, it was specified by the snippet-author and likely more descriptive than the trigger, and if the author did not specify a name, name is the same as trigger anyway