More needle updates for F39 backgrounds

Add the dark background variant, and update KDE systray needles
(thanks, translucency!)

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

needles/background/39_background-beta-night.json

@@ -0,0 +1,16 @@
+{
+  "area": [
+    {
+      "xpos": 786,
+      "ypos": 314,
+      "width": 81,
+      "height": 152,
+      "type": "match"
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "39_background",
+    "39_background_dark"
+  ]
+}

needles/kde/desktop_systray_notifications-dark-selected-20230906.json

@@ -0,0 +1,16 @@
+{
+  "area": [
+    {
+      "xpos": 603,
+      "type": "match",
+      "height": 16,
+      "ypos": 381,
+      "width": 79
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "DESKTOP-kde",
+    "desktop_systray_notifications"
+  ]
+}

needles/kde/desktop_update_notification_only-kde-20230906.json

@@ -0,0 +1,23 @@
+{
+  "area": [
+    {
+      "type": "match",
+      "xpos": 594,
+      "ypos": 392,
+      "height": 14,
+      "width": 132
+    },
+    {
+      "height": 173,
+      "width": 39,
+      "ypos": 394,
+      "xpos": 969,
+      "type": "match"
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "DESKTOP-kde",
+    "desktop_update_notification_only"
+  ]
+}