Restore the cockput updated "Reboot" needle

OK, so sometimes we have a Reboot button, sometimes a Restart
button, sometimes both, but never *always* one or the other. So
we need both needles. Sigh.

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

needles/cockpit/cockpit_updates_updated-reboot-20210323.json

@@ -0,0 +1,15 @@
+{
+  "area": [
+    {
+      "width": 56,
+      "ypos": 282,
+      "type": "match",
+      "height": 19,
+      "xpos": 319
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "cockpit_updates_updated"
+  ]
+}