resources: drop asterix PRF QR image

It is now rendered.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

resources/prf/asterix/resource_map.json

@@ -1,10 +0,0 @@
-{
-  "comments": "This file contains resource definitions for PRF and 'common' overrides",
-  "media": [
-    {
-      "type": "png",
-      "name": "LAUNCH_APP",
-      "file": "prf/asterix/images/app_qr.png"
-    }
-  ]
-}