[RN] Fix the visibility of the local video on the WelcomePage

react/features/welcome/components/styles.js

      * <tt>LocalVideoTrackUnderlay</tt>.
      */
     localVideoTrackUnderlay: fixAndroidViewClipping({
-        alignItems: 'center',
         alignSelf: 'stretch',
         backgroundColor: 'transparent',
-        flex: 1,
-        justifyContent: 'center'
+        flex: 1
     }),
 
     /**