RFR: 8329784: Run MaxMetaspaceSizeTest.java with -Xshare:off

[Ioi Lam]

Please review this trivial fix.

MaxMetaspaceSizeTest.java should be run with -Xshare:off to ensure that OOM is thrown. Please see [bug report](https://bugs.openjdk.org/browse/JDK-8329784) for details.

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Commit messages:
 - 8329784: Run MaxMetaspaceSizeTest.java with -Xshare:off

Changes: https://git.openjdk.org/jdk/pull/18658/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18658&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329784
  Stats: 4 lines in 1 file changed: 1 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/18658.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18658/head:pull/18658

PR: https://git.openjdk.org/jdk/pull/18658