Drop custom redhat. labels

- These should be standardized instead.
- But they also conflict with supporting multiple
  versions from a single container build in an
  ergonomic way.

Signed-off-by: Colin Walters <walters@verbum.org>

fedora-bootc-config.json

@@ -2,8 +2,6 @@
     "Labels": {
         "containers.bootc": "1",
         "bootc.diskimage-builder": "quay.io/centos-bootc/bootc-image-builder",
-        "redhat.id": "fedora",
-        "redhat.version-id": "rawhide"
     },
     "StopSignal": "SIGRTMIN+3",
     "Env": [