#4885 (ok 4.4.5) Some icons are above the overlay of jQuery dialogs

[Madhura Jayaratne]

These include,
in QA_4_4, #goto_pagetop and #lock_page_icon
in master, add more columns panel in table create/alter page

[Madhura Jayaratne]

Fixes
https://github.com/phpmyadmin/phpmyadmin/commit/31ab6f5bb2900d53ff978fe87c11c59e8eb142e4
https://github.com/phpmyadmin/phpmyadmin/commit/9cd65ce4de34b509a203910f833fc9270e811c79