<i18n dev> RFR: 8344025: Remove unused ISO2022.Encoder.maximumDesignatorLength

[Andrey Turbanov]

The field `sun.nio.cs.ext.ISO2022.Encoder#maximumDesignatorLength` appears to be unused.

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Commit messages:
 - [PATCH] Remove unused ISO2022.Encoder.maximumDesignatorLength

Changes: https://git.openjdk.org/jdk/pull/22031/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22031&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344025
  Stats: 6 lines in 1 file changed: 0 ins; 5 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22031.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22031/head:pull/22031

PR: https://git.openjdk.org/jdk/pull/22031