Fix crash when reload with overlays presented (#5774)

lib/ios/RNNOverlayManager.m

 }
 
 - (void)dismissAllOverlays {
-    for (RNNOverlayWindow* overlayWindow  in _overlayWindows) {
+    for (RNNOverlayWindow* overlayWindow  in [_overlayWindows reverseObjectEnumerator]) {
         [self detachOverlayWindow:overlayWindow];
     }
 }