Add another variant three_workspaces needle for navigation

Not sure why this seems to have so many variants, oh well.

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

needles/gnome/apps/navigation/navigation_three_workspaces-20250203.json

@@ -0,0 +1,15 @@
+{
+  "area": [
+    {
+      "xpos": 448,
+      "type": "match",
+      "width": 127,
+      "ypos": 96,
+      "height": 38
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "navigation_three_workspaces"
+  ]
+}