RFR: 8310512: Cleanup indentation in jfc files

[Christoph Langer]

Trivial whitespace cleanup in JFR jfc files.

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Commit messages:
 - JDK-8310512

Changes: https://git.openjdk.org/jdk/pull/14579/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14579&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310512
  Stats: 30 lines in 2 files changed: 0 ins; 4 del; 26 mod
  Patch: https://git.openjdk.org/jdk/pull/14579.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14579/head:pull/14579

PR: https://git.openjdk.org/jdk/pull/14579