In this commit, we update the UI to:
* Display emoji on the buddy list (right side sidebar).
* Display the emoji picker on the set status overlay.
It also updates the `z-index` of
`#set_user_status_modal`, which was changed from 105
to 1050 in 166bfa4cf8. We change it back to 105, so
emoji-popover can be visible on top of the
`#set_user_status_modal`.
We also remove the `tabindex` property from the
`#set_user_status_modal` so it can allow keyboard
events for emoji popover.
Riken Shah