RFR: 8375567: Remove AppContext usage from Swing Motif L&F classes [v2]

[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/d26d9655..4cfc2c54

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29282&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29282&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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