In `bp_core_add_contextual_help_content`(), move string concatenation to the end of the function, rather than on each switch case.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7632 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Remove unused `$current_tab` variable in `bp_admin_do_wp_nav_menu_meta_box()`.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7633 cdf35c40-ae34-48e0-9cc9-0c9da1808c22