RFR: 8360462: [macosx] row selection not working with Ctrl+Shift+Down/Up in AquaL&F

[Prasanta Sadhukhan]

Ctrl+Shift+Down/Up does extend row selection down or up in Aqua L&F as it does in native tree view in Finder.
Fixed the keybindings.

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Commit messages:
 - 8360462: [macosx] row selection not working with Ctrl+Shift+Down/Up in AquaL&F

Changes: https://git.openjdk.org/jdk/pull/25966/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25966&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8360462
  Stats: 108 lines in 2 files changed: 107 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25966.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25966/head:pull/25966

PR: https://git.openjdk.org/jdk/pull/25966