Revert to using AppTheme for LayoutLib tests.

Use AppTheme for all tests other than testExpand. AppTheme contains an
attribute needed by testArrayCheck. Also, since the AppTheme extends
Theme.Material.Light.DarkActionBar, other tests should be unaffected.

Also, update the golden image for the testArrayCheck.

Change-Id: Ib5f53f3b029c5aceef2b622e5ac63952d6b1972a