RFR: 8289611: MouseLocationOnScreenTest sometimes fails on Mac M1

[Andy Goryachev]

- using Screen.getVisualBounds() instead of Screen.getBounds()

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Commit messages:
 - 8289611: MouseLocationOnScreenTest sometimes fails on Mac M1

Changes: https://git.openjdk.org/jfx/pull/828/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=828&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289611
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/828.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/828/head:pull/828

PR: https://git.openjdk.org/jfx/pull/828