RFR: 8348135: Fix couple of problem listing entries in test/hotspot/jtreg/ProblemList-Virtual.txt

[Jaikiran Pai]

Can I please get a review of this trivial change which fixes two entries in the `test/hotspot/jtreg/ProblemList-Virtual.txt` problem listing file?

As noted in https://bugs.openjdk.org/browse/JDK-8348135, these two entries currently are considered malformed due to the `JDK-` prefix to the bug ids. The commit in this PR removes that prefix.

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Commit messages:
 - 8348135: Fix couple of problem listing entries in test/hotspot/jtreg/ProblemList-Virtual.txt

Changes: https://git.openjdk.org/jdk/pull/23206/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23206&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348135
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/23206.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23206/head:pull/23206

PR: https://git.openjdk.org/jdk/pull/23206