RFR: 8329787: Fix typo in CLDRConverter

[Naoto Sato]

Fix a file/class name in the `CLDRConverter` build tool, with some clean-up for a switch statement.

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/18662/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18662&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329787
  Stats: 393 lines in 4 files changed: 186 ins; 203 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/18662.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18662/head:pull/18662

PR: https://git.openjdk.org/jdk/pull/18662