RFR: 8296554: MouseLocationOnScreenTest sometime fails when system is busy

[Gopal Pattnaik]

There was a Assertion fail issue in mouse location test case JDK-8296554,
Reason: We felt the one mili second delay time for the Robot test may be insufficient in few OS.
Solution: We Changed the delay time to three mili second.

Verification:
Tested in Windows 11, and the Assert fail issue is not found.

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Commit messages:
 - Fix for MouseLocationOnScreenTest Assertion Fail

Changes: https://git.openjdk.org/jfx/pull/1772/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1772&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296554
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/1772.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1772/head:pull/1772

PR: https://git.openjdk.org/jfx/pull/1772