Updates to current theme message indicator.

git-svn-id: https://plugins.svn.wordpress.org/thx38/trunk@799420 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update styling of update message on top of theme screenshot.

git-svn-id: https://plugins.svn.wordpress.org/thx38/trunk@799421 b8457f37-d9ea-0310-8a92-e5e31aec5664