Don't use cross-origin request
    
    'Origin' for IPA login page is 'httpS://xxx'. But 'configured' link
    has URL like 'http://xxx/ssbrowser.html'.
    
    Since IPA web server doesn't use any kind of Access-Control-Allow-Origin
    rules Mozilla Firefox blocks Cross-Origin request due to the Same Origin
    policy violation.
    
    So, just follow the Same Origin policy.
    
    Fixes: https://pagure.io/freeipa/issue/7832
    Signed-off-by: Stanislav Levin <slev@altlinux.org>
    Reviewed-By: Serhii Tsymbaliuk <stsymbal@redhat.com>