Merge branch 'jk/push-delete-ref-error-message' into maint

The error message from "git push $there :bogo" (and its equivalent "git push $there --delete bogo") mentioned that we tried and failed to guess what ref is being deleted based on the LHS of the refspec, which we don't. * jk/push-delete-ref-error-message: push: don't guess at qualifying remote refs on deletion