[jdk25u] RFR: 8367948: JFR: MethodTrace threshold setting has no effect

[Aleksey Shipilev]

Fixes minor bug in new JFR feature added in JDK 25.

Additional testing:
 - [x] macos-aarch64-server-fastdebug, new regression test fails without the fix, passes with it
 - [x] macos-aarch64-server-fastdebug, `jdk_jfr`

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Commit messages:
 - Backport 4bc86a26db1eb3d054d80c9759fe04686e1e36b3

Changes: https://git.openjdk.org/jdk25u/pull/290/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=290&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367948
  Stats: 34 lines in 3 files changed: 29 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk25u/pull/290.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/290/head:pull/290

PR: https://git.openjdk.org/jdk25u/pull/290