forked from gitea/gitea

Backport #25312 by @wxiaoguang We only needs 2 lines to hide the dividers. ``` $dropdownLabelFilter.dropdown('setting', {'hideDividers': 'empty'}); $dropdownLabelFilter.dropdown('refreshItems'); ``` Other code blocks are refactored by the way.   Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>