Use View.INVISIBLE instead of View.GONE to hide ActivityIndicator

On Android, if the ActivityIndicator component is initially set to
animate={false}, it does not display if later set to true.

For some reason, the layout width/height of the associated ProgressBar
remains 0, despite the parent layout having the correct width/height.

I noticed that changing the visibility settings from View.GONE to
View.INVISIBLE didn't have an impact on the React Native layout, and
doing so appears to alleviate the issue.

Related to:
facebook#9023

ReactAndroid/src/main/java/com/facebook/react/views/progressbar/ProgressBarContainerView.java

@@ -73,7 +73,7 @@ public void apply() {
     if (mAnimating) {
       mProgressBar.setVisibility(View.VISIBLE);
     } else {
-      mProgressBar.setVisibility(View.GONE);
+      mProgressBar.setVisibility(View.INVISIBLE);
     }
   }