Drop match level of a KDE notifcations needle

Sigh, transparency or something. See:
https://openqa.fedoraproject.org/tests/723120#step/desktop_notifications/19

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

needles/kde/desktop_update_notification_systray-kde-20200929.json

@@ -5,11 +5,12 @@
             "type": "match",
             "width": 18,
             "xpos": 776,
-            "ypos": 741
+            "ypos": 741,
+            "match": 90
         }
     ],
     "properties": [],
     "tags": [
         "desktop_update_notification_systray"
     ]
-}
+}