Fix syntax error: missing closing brace in _onButtonPress

Fixed JavaScript syntax error that prevented extension from loading.
The outer else block in _onButtonPress (line 205) was missing its
closing brace, causing "expected expression, got ','" error.

Added missing closing brace after the inner if-else block.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

extension.js

@@ -253,6 +253,7 @@ ZoneEditor.prototype = {
                 'border-radius: 4px;'
             );
             this.editorOverlay.add_child(this.dimensionLabel);
+            }
         }
 
         return Clutter.EVENT_STOP;