Add a variant needle for nautilus "new window" menu entry

This is when it's highlighted in grey, for some reason.

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

needles/gnome/apps/nautilus/nautilus_menu_new_instance-grey-20230329.json

@@ -0,0 +1,15 @@
+{
+  "area": [
+    {
+      "width": 91,
+      "ypos": 98,
+      "height": 21,
+      "type": "match",
+      "xpos": 826
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "nautilus_menu_new_instance"
+  ]
+}