RFR: 208: git-publish: off-by-one error when parsing --quiet

[Erik Helin]

Hi all,

please review this tiny patch that fixes an (embarrassing) off-by-one indexing error in `GitPublish.java`.

Thanks,
Erik

## Testing
- [x] Manual testing of `git-publish`

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Commits:
 - 237380dd: skara-208

Changes: https://git.openjdk.java.net/skara/pull/334/files
 Webrev: https://webrevs.openjdk.java.net/skara/334/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-208
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/334.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/334/head:pull/334

PR: https://git.openjdk.java.net/skara/pull/334