Hit 'esc' rather than 'ret' to clear SDDM screensaver state
    
    OK, extending the timeout didn't work. Try this instead. The
    problem is when GNOME takes a long time to log out we wrongly
    decide we're in the "DM is showing a 'screensaver' state" case
    and hit 'ret' to clear it. In GDM that selects the highlighted
    user. Maybe if we use 'esc', it'll still work in SDDM to clear
    the screensaver state, but not select the first user in the list
    in GDM...
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>