RFR: git-pr: status cannot handle rfr label correctly

[Erik Helin]

Hi all,

please review this small pull request that updates how the status for a pull
request is calculated. We changed a while back to keep the "rfr" label on pull
requests that are ready (a PR is still "ready for review" even if it already has
been reviewed). `git pr status` wasn't updated however, so it printed the wrong
status for pull requests. This patch fixes this issue, so `git pr status` once
again works correctly.

Testing:
- Manual testing of `git pr status` and `git pr list`

Thanks,
Erik

-------------

Commits:
 - ecf961e1: git-pr: status cannot handle rfr label correctly

Changes: https://git.openjdk.java.net/skara/pull/419/files
 Webrev: https://webrevs.openjdk.java.net/skara/419/webrev.00
  Stats: 6 lines in 1 file changed: 2 ins; 2 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/419.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/419/head:pull/419

PR: https://git.openjdk.java.net/skara/pull/419