<i18n dev> RFR: 8317126: Redundant entries in Windows `tzmappings` file

[Naoto Sato]

Removing redundant entries in `lib/tzmappings` file on Windows. The file maps Windows time zones to Java time zones according to the region. Since `001` means world, no region-specific entries are needed if those time zones are the same. The diff of the generated tzmappings files, before and after the fix, is attached.
[tzmappings.diff.txt](https://github.com/openjdk/jdk/files/12752377/tzmappings.diff.txt)

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Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/15968/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15968&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317126
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15968.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15968/head:pull/15968

PR: https://git.openjdk.org/jdk/pull/15968