[jdk25u] RFR: 8366128: jdk/jdk/nio/zipfs/TestPosix.java::testJarFile uses wrong file

[Jonathan Dowland]

This is a trivial test only fix to backport for oracle parity.

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Commit messages:
 - Backport 22d3a6dd34a14994c7210365a5b982c9e65f5892

Changes: https://git.openjdk.org/jdk25u/pull/365/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=365&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366128
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk25u/pull/365.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/365/head:pull/365

PR: https://git.openjdk.org/jdk25u/pull/365