RFR: 8320348: java.io.File.getAbsolutePath fails if working directory is not on drive C

[Brian Burkhalter]

The method `windowsDriveRelative` of the test `java/io/File/GetAbsolutePath` was incorrectly translated from its previous version to the current JUnit 5 version.

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Commit messages:
 - 8320348: java.io.File.getAbsolutePath fails if working directory is not on drive C

Changes: https://git.openjdk.org/jdk/pull/16720/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16720&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320348
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/16720.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16720/head:pull/16720

PR: https://git.openjdk.org/jdk/pull/16720