Fix Bug: Unable to click board submenu on mobile.
Fix Bug: Unable to click board submenu on mobile.

Thanks to xet7 !

Closes #2261

GhassenRjab/wekan,wekan/wekan,wekan/wekan,wekan/wekan,GhassenRjab/wekan,GhassenRjab/wekan,wekan/wekan,wekan/wekan