Merge branch 'dr/ref-filter-push-track-fix'

Merge branch 'dr/ref-filter-push-track-fix'

%(push:track) token used in the --format option to "git
for-each-ref" and friends was not showing the right branch, which
has been fixed.

* dr/ref-filter-push-track-fix:
  ref-filter: use correct branch for %(push:track)