Fix graphical update tests with some new needle variants

The way GNOME Software displays an error after running into RHBZ
1314991 has changed, it seems, so we need a variant needle to
cope with that. Also, when an upgrade notification is visible,
the 'Restart & Update' button for doing a regular update is
shown in grey (not blue), so we need a variant needle to handle
that too.

needles/gnome/desktop_package_tool_update_apply-grey-20171219.json

@@ -0,0 +1,16 @@
+{
+  "tags": [
+    "DESKTOP-gnome",
+    "desktop_package_tool_update_apply"
+  ],
+  "area": [
+    {
+      "width": 112,
+      "xpos": 802,
+      "height": 17,
+      "ypos": 439,
+      "type": "match"
+    }
+  ],
+  "properties": []
+}

needles/gnome/desktop_package_tool_update_bz1314991-20171219.json

@@ -0,0 +1,16 @@
+{
+  "area": [
+    {
+      "width": 191,
+      "xpos": 393,
+      "ypos": 92,
+      "type": "match",
+      "height": 21
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "DESKTOP-gnome",
+    "desktop_package_tool_update_bz1314991"
+  ]
+}