Style: normalize function formatting in core-js

Adjust whitespace, indentation and add missing semicolon in the returned function inside NullProtoObjectViaSc64bit. This is a purely stylistic change (spacing around `function` and consistent indentation) and does not alter runtime behavior.

app/assets/js/core-js-3.49.0.wsh.js

@@ -2421,9 +2421,9 @@ var NullProtoObjectViaSc64bit = function () {
     // If all attempts to retrieve a new object from an external instance fail,
     // the existing object is returned.
     // This prevents errors during the key deletion process using enumBugKeys afterward.
-    return function() {
-        return {};
-    }
+    return function () {
+      return {};
+    };
   }
 }