audit: fix create-or-update-audit-pr.sh
audit: fix create-or-update-audit-pr.sh

A fix and some changes to support k8s-infra image:

- fix typo in 'fork' remote uri
- create or update 'fork' remote
- don't rebuild pr-creator if it's already in PATH

kubernetes/k8s.io,kubernetes/k8s.io,kubernetes/k8s.io,kubernetes/k8s.io