RFR: Proper name for hgupdate-sync-label

[Robin Westberg]

Hi all,

Please review this minor change that updates the name of the sync label to the one actually in use.

Best regards,
Robin

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Commit messages:
 - Proper name for hgupdate-sync-label

Changes: https://git.openjdk.java.net/skara/pull/795/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=795&range=00
  Stats: 5 lines in 3 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/skara/pull/795.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/795/head:pull/795

PR: https://git.openjdk.java.net/skara/pull/795