Update KDE systray expand needle for new F35 background

Use a 90 match level because it seems it can vary a bit, saw a
94 in https://openqa.fedoraproject.org/tests/971978#step/desktop_notifications/33

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

needles/kde/desktop_expand_systray-darkgrey-20210907.json

@@ -0,0 +1,17 @@
+{
+  "area": [
+    {
+      "type": "match",
+      "ypos": 738,
+      "width": 17,
+      "xpos": 877,
+      "height": 18,
+      "match": 90
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "DESKTOP-kde",
+    "desktop_expand_systray"
+  ]
+}