efe7943 Provide some feedback to the user when changing monitoring worked

Authored and Committed by pingou 4 years ago
    Provide some feedback to the user when changing monitoring worked
    
    Basically, a small checked mark will appear next to the drop-down when
    the ajax request succeeded.
    
    Fixes https://pagure.io/pagure-dist-git/issue/79
    
    Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>