RFR: 8333398: Uncomment the commented test in test/jdk/java/util/jar/JarFile/mrjar/MultiReleaseJarAPI.java

[Jaikiran Pai]

Can I please get a review of this test-only change which uncomments an additional test that was commented out in `test/jdk/java/util/jar/JarFile/mrjar/MultiReleaseJarAPI.java`?

As noted in https://bugs.openjdk.org/browse/JDK-8333398, the original issue due to which this line was commented out in the test, has been fixed several releases back and thus this line can now be uncommented.

I've verified that this test continues to pass with these changes.

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Commit messages:
 - 8333398: Uncomment the commented test in test/jdk/java/util/jar/JarFile/mrjar/MultiReleaseJarAPI.java

Changes: https://git.openjdk.org/jdk/pull/19514/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19514&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333398
  Stats: 5 lines in 1 file changed: 0 ins; 3 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/19514.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19514/head:pull/19514

PR: https://git.openjdk.org/jdk/pull/19514