partly fix failing SplitNavigatorView mustella tests
5 out of 6 fails are fixed.
The remaining fail is due to incorrect Callout skin implementation:
see https://issues.apache.org/jira/browse/FLEX-33809
fix failing SplitNavigatorView mustella tests
  fix baseline bitmap for android 240 ppi.
yet to update other ppi / os baseline bitmaps
see https://issues.apache.org/jira/browse/FLEX-33809