webui: control sudo rule deny command tables by category switch
    
    `memberdenycmd_sudocmd` and `memberdenycmd_sudocmdgroup` tables are now
    enabled/disabled based on `cmdcategory` as well.
    
    https://fedorahosted.org/freeipa/ticket/4361
    
    Reviewed-By: Nathaniel McCallum <npmccallum@redhat.com>