<i18n dev> RFR: 8378385: Remove AppContext from AWT Windows implementation classes

[Phil Race]

Remove most uses of AppContext from Windows AWT classes.
No existing tests fail with this change.

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Commit messages:
 - 8378385

Changes: https://git.openjdk.org/jdk/pull/29858/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29858&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378385
  Stats: 39 lines in 6 files changed: 0 ins; 26 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/29858.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29858/head:pull/29858

PR: https://git.openjdk.org/jdk/pull/29858