RFR: 8343488: Test VectorRebracket128Test.java can't exclude by test/hotspot/jtreg/ProblemList.txt

[SendaoYan]

Hi all,
The test `test/hotspot/jtreg/compiler/vectorapi/VectorRebracket128Test.java` can't exclude from `test/hotspot/jtreg/ProblemList.txt` correctly. The test only contains a single test, so it do not need to set test suffix.
This PR remove the test suffix to make the Problemlist work normally, trivial fix, no risk.

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Commit messages:
 - 8343488: Test VectorRebracket128Test.java can't exclude by test/hotspot/jtreg/ProblemList.txt

Changes: https://git.openjdk.org/jdk/pull/21968/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21968&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343488
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/21968.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21968/head:pull/21968

PR: https://git.openjdk.org/jdk/pull/21968