fix(ts) drop bogus method anotations

react/features/recording/components/Recording/web/StopRecordingDialog.tsx

@@ -35,8 +35,6 @@ class StopRecordingDialog extends AbstractStopRecordingDialog<IProps> {
         );
     }
 
-    _onSubmit: () => boolean;
-
     /**
      * Toggles screenshot capture.
      *

react/features/video-menu/components/web/GrantModeratorDialog.tsx

@@ -27,8 +27,6 @@ class GrantModeratorDialog extends AbstractGrantModeratorDialog {
             </Dialog>
         );
     }
-
-    _onSubmit: () => boolean;
 }
 
 export default translate(connect(abstractMapStateToProps)(GrantModeratorDialog));