Add a variant leftbar_server needle for when VNC isn't fullscreen

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

needles/anaconda/identification/leftbar_server-notfull-20230811.json

@@ -0,0 +1,20 @@
+{
+  "area": [
+    {
+      "xpos": 9,
+      "type": "match",
+      "ypos": 72,
+      "height": 692,
+      "width": 134
+    }
+  ],
+  "properties": [
+    {
+      "name": "workaround",
+      "value": "this matches when the VNC window is not fullscreen as it should be"
+    }
+  ],
+  "tags": [
+    "leftbar_server"
+  ]
+}