Add variant clocks_alarm_hour needle for when it's already active

This is still the case on the flatpak build as it runs behind the
RPM build, and would still be the case if we run the test on an
F40 respin for e.g.

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

needles/gnome/apps/clocks/clocks_alarm_hour-active-20240926.json

@@ -0,0 +1,15 @@
+{
+  "area": [
+    {
+      "height": 36,
+      "type": "match",
+      "ypos": 217,
+      "xpos": 409,
+      "width": 47
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "clocks_alarm_hour"
+  ]
+}