RFR: 8375567: Remove AppContext usage from Swing Motif L&F classes [v3]

[Phil Race]

> Remove AppContext from the Swing Motif L&F implementation.

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8375567

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29282/files
  - new: https://git.openjdk.org/jdk/pull/29282/files/4cfc2c54..dd7b8459

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29282&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29282&range=01-02

  Stats: 8 lines in 4 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/29282.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29282/head:pull/29282

PR: https://git.openjdk.org/jdk/pull/29282