RFR: 8364506: javax/swing/Popup/TaskbarPositionTest.java can fail subsequent tests on MacOS

[Manukumar V S]

Issue:
javax/swing/Popup/TaskbarPositionTest.java can fail subsequent tests on MacOS because of using 'Cntrl+Down Arrow' as this acts as a shortcut in MacOS to show all windows related to the focused one.

Fix:
Change the 'Cntrl' key to 'Shift'

Testing:
Tested in all supported platforms using mach5 and got all PASS.

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Commit messages:
 - 8364506: javax/swing/Popup/TaskbarPositionTest.java can fail subsequent tests on MacOS

Changes: https://git.openjdk.org/jdk/pull/26623/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26623&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364506
  Stats: 8 lines in 1 file changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/26623.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26623/head:pull/26623

PR: https://git.openjdk.org/jdk/pull/26623