RFR: 8343848: Fix typo of propery name in TestOAEPPadding after 8341927

[Goetz Lindenmaier]

Trivial fix of typo.

Thanks to @RealLucy for spotting this!

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Commit messages:
 - 8343848: Fix typo of propery name in TestOAEPPadding after 8341927

Changes: https://git.openjdk.org/jdk/pull/21990/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21990&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343848
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21990.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21990/head:pull/21990

PR: https://git.openjdk.org/jdk/pull/21990