RFR: 1678: Missed calling lastBatchHandled in TestInfoBot

[Erik Joelsson]

After spending the extra time documenting the need for calling "lastBatchHandled" on the PullRequestPoller, I still managed to forget in the TestInfoBot.

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

Commit messages:
 - SKARA-1678

Changes: https://git.openjdk.org/skara/pull/1420/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1420&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1678
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/skara/pull/1420.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1420/head:pull/1420

PR: https://git.openjdk.org/skara/pull/1420