Remove unused variable. props jeremyfelt. fixes #25121.
Built from https://develop.svn.wordpress.org/trunk@25098


git-svn-id: http://core.svn.wordpress.org/trunk@25080 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove redundant context for Child Themes link. fixes #25079.
Built from https://develop.svn.wordpress.org/trunk@25099


git-svn-id: http://core.svn.wordpress.org/trunk@25081 1a063a9b-81f0-0310-95a4-ce76da25c4cd