core/images/archive: normalizeReference: remove outdated TODO

This TODO was added in 9e6db71954, at which time
the reference package was part of the docker/distribution (registry) repository.
The reference package has moved to a standalone module, which has been in use
since 4923470902, so this should no longer be a
concern.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

core/images/archive/reference.go

@@ -72,7 +72,6 @@ func isImagePrefix(s, prefix string) bool {
 }
 
 func normalizeReference(ref string) (string, error) {
-	// TODO: Replace this function to not depend on reference package
 	normalized, err := distref.ParseDockerRef(ref)
 	if err != nil {
 		return "", fmt.Errorf("normalize image ref %q: %w", ref, err)