Fix border not drawing when there is a background color set

Summary: There is a bug in border drawing code that will not draw the border if the element has a background color. This diff fixes it.

Reviewed By: sriramramani

Differential Revision: D2919549

ReactAndroid/src/main/java/com/facebook/react/flat/DrawBorder.java

@@ -204,7 +204,6 @@ import com.facebook.csslayout.Spacing;
     if (mBackgroundColor != 0) {
       PAINT.setColor(mBackgroundColor);
       canvas.drawPath(getPathForBorderRadius(), PAINT);
-      return;
     }
 
     drawBorders(canvas);