Update a couple of GDM needles for change in GNOME Shell 44.1

I think the shade of grey on the background changed. We'll
probably need more needle updates for the compose tests (the
desktop_login test and different languages), but this covers the
update tests.

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

needles/gnome/login_gdm-newlogo-20230425.json

@@ -0,0 +1,17 @@
+{
+  "area": [
+    {
+      "type": "match",
+      "height": 49,
+      "ypos": 678,
+      "xpos": 433,
+      "width": 159
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "graphical_login",
+    "login_screen",
+    "DESKTOP-gnome"
+  ]
+}

needles/gnome/login_gdm_input-20230425.json

@@ -0,0 +1,17 @@
+{
+  "area": [
+    {
+      "height": 45,
+      "ypos": 457,
+      "width": 56,
+      "xpos": 391,
+      "type": "match"
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "graphical_login_input",
+    "DESKTOP-gnome",
+    "LANGUAGE-english"
+  ]
+}