Add UEFI variant of grub error page needle, rename BIOS one

The --MORE-- text looks different with the UEFI firmware font,
so we need another needle. Also I named the original needle
wrong, bad me.

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

needles/console/grub_error_page-uefi-20180819.json

@@ -0,0 +1,17 @@
+{
+  "tags": [
+    "grub_error_page"
+  ],
+  "properties": [
+    "workaround"
+  ],
+  "area": [
+    {
+      "xpos": 87,
+      "width": 51,
+      "type": "match",
+      "ypos": 520,
+      "height": 14
+    }
+  ]
+}