[master] RFR: OMWorld: Fix enter_for is_value_based bug

[Stefan Karlsson]

There was a copy-n-paste error in one of the previous OMWorld patches. `handle_sync_on_value_based_class` expects the `locking_thread` and not the `current` thread.

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Commit messages:
 - OMWorld: Fix enter_for is_value_based bug

Changes: https://git.openjdk.org/lilliput/pull/168/files
  Webrev: https://webrevs.openjdk.org/?repo=lilliput&pr=168&range=00
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/lilliput/pull/168.diff
  Fetch: git fetch https://git.openjdk.org/lilliput.git pull/168/head:pull/168

PR: https://git.openjdk.org/lilliput/pull/168