<i18n dev> RFR: 8348365: Bad format string in CLDRDisplayNamesTest

[Liam Miller-Cushon]

This change fixes an incorrect call to `printf` for a failure message in `CLDRDisplayNamesTest`.

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Commit messages:
 - 8348365: Bad format string in CLDRDisplayNamesTest

Changes: https://git.openjdk.org/jdk/pull/23252/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23252&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348365
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23252.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23252/head:pull/23252

PR: https://git.openjdk.org/jdk/pull/23252