fix rawhide/branched sync messages
    
    Since moving these scripts to fedora-messaging we haven't seen the rsync
    messages show up. It turns out they are there, but they are showing up
    as 'composerawhide' instead of 'compose.rawhide'. Try and add a . in
    there to get them back to normal.
    
    See https://pagure.io/fedora-infrastructure/issue/9148
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>