fix: enable show_in_snippet by default

Author: Saghen

lua/blink/cmp/config.lua

@@ -263,7 +263,7 @@ local config = {
       -- list of additional trigger characters that won't trigger the completion window when the cursor comes after a trigger character when entering insert mode/accepting an item
       show_on_x_blocked_trigger_characters = { "'", '"', '(' },
       -- when false, will not show the completion window when in a snippet
-      show_in_snippet = false,
+      show_in_snippet = true,
     },
 
     signature_help = {