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

The error message from "git push $there :bogo" mentioned we tried
and failed to guess what ref is being deleted based on the LHS of
the refspec, which we don't.

# By Jeff King
* jk/push-delete-ref-error-message:
  push: don't guess at qualifying remote refs on deletion

diff --cc remote.c
Simple merge