Allow WP_List_Table::_js_vars() to take an array of additional args to add....

Allow WP_List_Table::_js_vars() to take an array of additional args to add. Allows us to have a single variable printing data when child classes need more data. Also, fix compact() call in [20094]. see #19815.

git-svn-id: https://core.svn.wordpress.org/trunk@20100 1a063a9b-81f0-0310-95a4-ce76da25c4cd