Fix a regression of positioning in Attachment Display Settings.

props paulwilde.
see #24716.
Built from https://develop.svn.wordpress.org/trunk@29000


git-svn-id: http://core.svn.wordpress.org/trunk@28788 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix alignment of Advanced Options close toggle arrow in Edit Media dialog.

props paulwilde.
fixes #28752.
Built from https://develop.svn.wordpress.org/trunk@29001


git-svn-id: http://core.svn.wordpress.org/trunk@28789 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Reinstate 'install_themes_tabs' filter.

props ghost1227.
fixes #28578.
Built from https://develop.svn.wordpress.org/trunk@29002


git-svn-id: http://core.svn.wordpress.org/trunk@28790 1a063a9b-81f0-0310-95a4-ce76da25c4cd