Reduce match level for a KDE no notifications needle

Got a 92% match at
https://openqa.fedoraproject.org/tests/1661285#step/desktop_notifications/21

Signed-off-by: Adam Williamson <awilliam@redhat.com>

needles/kde/desktop_no_notifications-kde-20221102.json

@@ -3,6 +3,7 @@
     {
       "xpos": 698,
       "type": "match",
+      "match": 90,
       "width": 209,
       "height": 17,
       "ypos": 586
@@ -13,4 +14,4 @@
     "DESKTOP-kde",
     "desktop_no_notifications"
   ]
-}
+}