Fixing `CLDRConverter` build tool to not regard [new locales](https://github.com/unicode-org/cldr/pull/2508/files#diff-94cbefde02914335da884f768063a06a84ad651ee4e56cdb1cb90625d7776731) introduced in CLDR 43 as one of the base locales. Otherwise they would incorrectly go into `java.base` module, then a test case fails.
------------- Commit messages: - 8298808: Check `script` code on detecting the base locales Changes: https://git.openjdk.org/jdk/pull/11684/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11684&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8298808 Stats: 12 lines in 2 files changed: 9 ins; 1 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/11684.diff Fetch: git fetch https://git.openjdk.org/jdk pull/11684/head:pull/11684 PR: https://git.openjdk.org/jdk/pull/11684
