RFR: 306: Automatic merge conflicts PR only have repo in title when needed

[Erik Helin]

Hi all,

please review this small patch that ensures that automatic merge conflicts PRs
only shows the repo in the title if the from and target repository differs.

Testing:
- `make test` on Linux x64

Thanks,
Erik

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Commit messages:
 - skara-306

Changes: https://git.openjdk.java.net/skara/pull/522/files
 Webrev: https://webrevs.openjdk.java.net/skara/522/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-306
  Stats: 8 lines in 1 file changed: 4 ins; 3 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/522.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/522/head:pull/522

PR: https://git.openjdk.java.net/skara/pull/522