814f201 webui: use API call ca_is_enabled instead of enable_ra env variable.

Authored and Committed by pvoborni 8 years ago
    webui: use API call ca_is_enabled instead of enable_ra env variable.
    
    To be consistent with backend code.
    
    https://fedorahosted.org/freeipa/ticket/5622
    
    Reviewed-By: Pavel Vomacka <pvomacka@redhat.com>