Fix RCTDevLoadingView position (facebook#46005)

Summary:
Pull Request resolved: facebook#46005

The RCTDevLoadingView is clipped in Mac Catalyst, hiding half of it under the toolbar. This change maintains the behavior on iOS of extending past the dynamic island.

{F1803665273}

Changelog: [Internal]

Reviewed By: shwanton

Differential Revision: D61209780

fbshipit-source-id: 6c9c572a9e47a8caf191c40fb53c4a7d43b64281

Author: sbuggay

packages/react-native/React/CoreModules/RCTDevLoadingView.mm

@@ -119,8 +119,13 @@ - (void)showMessage:(NSString *)message color:(UIColor *)color backgroundColor:(
       CGFloat windowWidth = window.bounds.size.width;
 
       self->_window = [[UIWindow alloc] initWithWindowScene:window.windowScene];
+#if TARGET_OS_MACCATALYST
+      self->_window.frame = CGRectMake(0, window.safeAreaInsets.top, windowWidth, 20);
+      self->_label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, windowWidth, 20)];
+#else
       self->_window.frame = CGRectMake(0, 0, windowWidth, window.safeAreaInsets.top + 10);
       self->_label = [[UILabel alloc] initWithFrame:CGRectMake(0, window.safeAreaInsets.top - 10, windowWidth, 20)];
+#endif
       [self->_window addSubview:self->_label];
 
       self->_window.windowLevel = UIWindowLevelStatusBar + 1;