fix(test): forgot to change selection text

Author: ankddev

compiler-core/src/language_server/tests/action.rs

@@ -10720,7 +10720,7 @@ pub fn add_one(thing) {
   thing + 1
 }
 "#,
-        find_position_of("fn").select_until(find_position_of("("))
+        find_position_of("thing + 1").to_selection()
     );
 }