WebUI: Add confirmation dialog for changing default user/host group
Changing default group on automember rules page is too easy.
Add a confirmation dialog to avoid misclick in the case.
Ticket: https://pagure.io/freeipa/issue/8322
Signed-off-by: Serhii Tsymbaliuk <stsymbal@redhat.com>
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>