[jdk18u] RFR: 8287644: [18u] Backport of JDK-8240903 causes test errors

[Christoph Langer]

jmod in 18u does not have the option --date which causes a test error. We can leave out its usage in the test.

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Commit messages:
 - JDK-8287644

Changes: https://git.openjdk.java.net/jdk18u/pull/145/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18u&pr=145&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8287644
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk18u/pull/145.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18u pull/145/head:pull/145

PR: https://git.openjdk.java.net/jdk18u/pull/145