RFR: forge: fix GitLabRepository.recentCommitComments

[Erik Helin]

Hi all,

please review this patch that fixes `recentCommitsComments` for `GitLabRepository`. The formatting of the `after` parameter was wrong (used day of year instead of day of month) and the `id` was using `String` instead of `int` as type.

Thanks,
Erik

- Fix formatting of "after"
- Fix type of "id"

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Commit messages:
 - forge: fix GitLabRepository.recentCommitComments

Changes: https://git.openjdk.java.net/skara/pull/912/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=912&range=00
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/skara/pull/912.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/912/head:pull/912

PR: https://git.openjdk.java.net/skara/pull/912