RFR: 7903813: Tag enablePreview with false should take precedence [v2]

[Christian Stein]

> Please review this change to let tests with `enablePreview=false` take precedence over for example libraries that require preview features being enabled.
> 
> Note that the [PreviewHiddenClass](https://github.com/openjdk/jdk/blob/f6d7e30b84fedbf42077526610ba7a5bcfaece4c/test/jdk/java/lang/invoke/defineHiddenClass/PreviewHiddenClass.java#L34-L35) test should receive an explicit `enablePreview=false` tag line (in addition to the comment).

Christian Stein has updated the pull request incrementally with one additional commit since the last revision:

  Fix logic

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

Changes:
  - all: https://git.openjdk.org/jtreg/pull/225/files
  - new: https://git.openjdk.org/jtreg/pull/225/files/ef602141..c8690326

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jtreg&pr=225&range=01
 - incr: https://webrevs.openjdk.org/?repo=jtreg&pr=225&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jtreg/pull/225.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/225/head:pull/225

PR: https://git.openjdk.org/jtreg/pull/225