[lworld] RFR: 8363956: [lworld] Valhalla vauetypes tests enablePreview should be per test

[Roger Riggs]

The enable for preview should be per test, not per test directory.

Remove enablePreview = true from valhalla/valuetypes/TEST.properties and add to tests as needed

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Commit messages:
 - 8363956: [lworld] Valhalla vauetypes tests enablePreview should be per test

Changes: https://git.openjdk.org/valhalla/pull/1515/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1515&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8363956
  Stats: 4 lines in 2 files changed: 3 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/1515.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1515/head:pull/1515

PR: https://git.openjdk.org/valhalla/pull/1515