Add KDE package refresh needle, tweak retry logic a bit
    
    KDE update was still often failing on #1943943, so this tries a
    bit harder to work around it. We add a 'refresh' needle for KDE,
    and tweak the 'retry' logic to click it if we get to that point.
    Note adding the needle also changes behaviour slightly - we may
    click this needle if we see it on first entering the screen. So
    either change may be helping. Either way, this does make the test
    more reliable.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>