fix(recording): return true to close stop recording modal on cancel (#2776)

react/features/recording/components/LiveStream/StopLiveStreamDialog.web.js

         super(props);
 
         // Bind event handler so it is only bound once for every instance.
+        this._onCancel = this._onCancel.bind(this);
         this._onSubmit = this._onSubmit.bind(this);
     }
 
         return (
             <Dialog
                 okTitleKey = 'dialog.stopLiveStreaming'
-                onCancel = { this.props.onCancel }
+                onCancel = { this._onCancel }
                 onSubmit = { this._onSubmit }
                 titleKey = 'dialog.liveStreaming'
                 width = 'small'>
         );
     }
 
+    /**
+     * Callback invoked when stopping of live streaming is canceled.
+     *
+     * @private
+     * @returns {boolean} True to close the modal.
+     */
+    _onCancel() {
+        this.props.onCancel();
+
+        return true;
+    }
+
     /**
      * Callback invoked when stopping of live streaming is confirmed.
      *