ref(circular-label): animate after dom updates

Based on react-native docs, looks like animations should be
started after mount. Updating animation states I'm not certain
on so I moved it to componentDidUpdate and tested with the
live streaming label to ensure the component still animated fine.

react/features/base/label/components/CircularLabel.native.js

         this.state = {
             pulseAnimation: new Animated.Value(0)
         };
+    }
 
-        this._maybeToggleAnimation({}, props);
+    /**
+     * Implements {@code Component#componentDidMount}.
+     *
+     * @inheritdoc
+     */
+    componentDidMount() {
+        this._maybeToggleAnimation({}, this.props);
     }
 
     /**
-     * Implements {@code Component#componentWillReceiveProps}.
+     * Implements {@code Component#componentDidUpdate}.
      *
      * @inheritdoc
      */
-    componentWillReceiveProps(newProps: Props) {
-        this._maybeToggleAnimation(this.props, newProps);
+    componentDidUpdate(prevProps: Props) {
+        this._maybeToggleAnimation(prevProps, this.props);
     }
 
     /**