RFR: 7417: Fix incorrect identifier in result for biased locking revocation rule

[mohno007]

This PR fixes a wrong placeholder in `BiasedLockingRevocationRule_TEXT_REVOKED_CLASSES_FOUND_LONG`.

`BiasedLockingRevocationRule.java` used `{revokedClasses}` for placeholder identifier but `messages.properties` used `{revokedTypes}`.

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Commit messages:
 - Fix wrong placeholder in BiasedLockingRevocationRule

Changes: https://git.openjdk.java.net/jmc/pull/309/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=309&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7417
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jmc/pull/309.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/309/head:pull/309

PR: https://git.openjdk.java.net/jmc/pull/309