desktop_update_graphical: always refresh
    
    This is yet another twiddle to that same damn bit where we try
    to apply updates. This more or less reverts the last tweak to
    it, where we skipped hitting 'refresh' if 'download' or 'apply'
    are already visible. The trouble with that is that the app may
    have already found and prepared updates before we got our
    "prepared" python3-kickstart update in place - so the update
    operation might work perfectly, but not update the package we
    expect it to update, and the test may fail.
    
    This time, let's try *always* refreshing, then wait a bit after
    hitting the refresh button before we start looking for apply
    or download to try and avoid the 'race' we were trying to solve
    with the last tweak (where we hit refresh then immediately try
    to hit a download or apply button which vanishes before we can
    hit it). I think this should be safe as both KDE and GNOME
    should always show a refresh button now (this wasn't the case
    before, I think, F34).
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>