Update Rhythmbox app needle

The icon changed, so the needle needs changing.

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

needles/gnome/apps/apps_menu_rhythmbox-20200106.json

@@ -0,0 +1,15 @@
+{
+  "area": [
+    {
+      "ypos": 568,
+      "height": 59,
+      "xpos": 213,
+      "width": 47,
+      "type": "match"
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "apps_menu_rhythmbox"
+  ]
+}