libimage: pull: remove TODO

While in theory it would be optimal if the shortnames package returned
such an error, there is no need for it in practice since others error
sources such as an invalid input name would already error out before.

Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>

common/libimage/pull.go

@@ -533,9 +533,6 @@ func (r *Runtime) copySingleImageFromRegistry(ctx context.Context, imageName str
 	sys := r.systemContextCopy()
 	resolved, err := shortnames.Resolve(sys, imageName)
 	if err != nil {
-		// TODO: that is a too big of a hammer since we should only
-		// ignore errors that indicate that there's no alias and no
-		// USRs.  Must be addressed in c/image first.
 		if localImage != nil && pullPolicy == config.PullPolicyNewer {
 			return []string{resolvedImageName}, nil
 		}