WebUI: Fix adding member manager for groups and host groups
    
    - fix API method call for adding member manager
    - fix regressions in host group associated tables
    
    Ticket: https://pagure.io/freeipa/issue/8123
    
    Signed-off-by: Serhii Tsymbaliuk <stsymbal@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>