RFR: 8377352: Parallel: Incorrect capacity in GC overhead log

[Albert Mingkun Yang]

Trivial oneliner fix in GC logs.

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Commit messages:
 - pgc-log-bug-fix

Changes: https://git.openjdk.org/jdk/pull/29603/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29603&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8377352
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/29603.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29603/head:pull/29603

PR: https://git.openjdk.org/jdk/pull/29603