RFR: 8378386: Remove AppContext from AWT ModalEventFilter.java

[Phil Race]

Remove AppContext from java/awt/ModalEventFilter.java

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Commit messages:
 - 8378386

Changes: https://git.openjdk.org/jdk/pull/29859/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29859&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378386
  Stats: 20 lines in 1 file changed: 0 ins; 14 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/29859.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29859/head:pull/29859

PR: https://git.openjdk.org/jdk/pull/29859