Twenty Fifteen: admin-custom-header.css was emptied in r30567 so let's remove it entirely.

Props kwight, fixes #30648.



git-svn-id: https://develop.svn.wordpress.org/trunk@30801 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fifteen: we should be checking for twentyfifteen_get_color_scheme_choices here not twentyfifteen_get_color_scheme_control_options

Props iamtakashi, fixes #30652



git-svn-id: https://develop.svn.wordpress.org/trunk@30802 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fifteen: prevent jumping on hover in blog footer links with Safari

Props iamtakashi, fixes #30654.



git-svn-id: https://develop.svn.wordpress.org/trunk@30803 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fifteen: less than or equal to is incorrect here when the sidebar only appears at 955px -- it should be less than for removal of inline styles.

Props iamtakashi, fixes #30656



git-svn-id: https://develop.svn.wordpress.org/trunk@30804 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fifteen: correct escaping.

Props iamtakashi, fixes #30651.



git-svn-id: https://develop.svn.wordpress.org/trunk@30805 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fifteen: minor file cleanup.

Props iamtakashi, fixes #30653.



git-svn-id: https://develop.svn.wordpress.org/trunk@30806 602fd350-edb4-49c9-b593-d223f7449a82