Reduce login_cockpit needle match area

There seem to be some weird shenanigans going on with the pipe
bit here (it looks different on different test runs? what?) so
let's just match on the plain grey area. Should still be enough.

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

needles/cockpit/login-cockpit234-20201215.json

@@ -1,15 +1,15 @@
 {
-  "area": [
-    {
-      "width": 227,
-      "height": 77,
-      "ypos": 176,
-      "type": "match",
-      "xpos": 575
-    }
-  ],
-  "properties": [],
-  "tags": [
-    "cockpit_login"
-  ]
+    "area": [
+        {
+            "height": 77,
+            "type": "match",
+            "width": 67,
+            "xpos": 730,
+            "ypos": 176
+        }
+    ],
+    "properties": [],
+    "tags": [
+        "cockpit_login"
+    ]
 }