Revert "Fix duplicating "Make sticky" buttons."

This reverts commit 146cd3e8f8eafa67758bb9a018a5fe8ecf22943f.
Revert "Revert "Fixed #97: Enable sticky button for issue summary and full issue update form, too.""

This reverts commit 7342181534094f17a6996ed46e713e5289db4317.