ipatests: update expected output for boolean attribute
    
    Now that IPA API properly maps LDAP boolean attributes to the
    python bool type, they are displayed as True/False instead
    of TRUE/FALSE in the ipa *-show outputs.
    
    Update the expected output for DNS Active Zone.
    
    Related: https://pagure.io/freeipa/issue/9171
    Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>