Unicode fix for new wincompose version (#5082)

* unicode fix for new wincompose version

* move wincompose case to linux

* Change unicode input end to enter

quantum/process_keycode/process_unicode_common.c

@@ -118,6 +118,9 @@ void unicode_input_finish(void) {
   case UC_WIN:
     unregister_code(KC_LALT);
     break;
+  case UC_WINC:
+    tap_code(KC_ENTER);
+    break;
   }
 
   set_mods(saved_mods); // Reregister previously set mods