Fix wrong indentation in [29136].
Built from https://develop.svn.wordpress.org/trunk@29172


git-svn-id: http://core.svn.wordpress.org/trunk@28956 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unused variable in `WP_Theme_Install_List_Table::install_theme_info()`. Unused since [26380].

props Corphi.
fixes #28749.
Built from https://develop.svn.wordpress.org/trunk@29173


git-svn-id: http://core.svn.wordpress.org/trunk@28957 1a063a9b-81f0-0310-95a4-ce76da25c4cd