gpui_macos: Fix compilation on x86_64 (#52028)

Release Notes:

- N/A or Added/Fixed/Improved ...

crates/gpui_macos/src/platform.rs

@@ -395,7 +395,7 @@ impl MacPlatform {
                     if *checked {
                         item.setState_(NSVisualEffectState::Active);
                     }
-                    item.setEnabled_(!disabled);
+                    item.setEnabled_(if *disabled { NO } else { YES });
 
                     let tag = actions.len() as NSInteger;
                     let _: () = msg_send![item, setTag: tag];