Fix editing comments on issues and PRs
    
    This commit fixes editing comments added via JS when the SSE is down/not
    responding as well as fixes an issue where the edit box/form would stay
    displayed after having submitted it.
    
    Fixes https://pagure.io/pagure/issue/3800
    
    Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>