RFR: 8344581: [TESTBUG] java/awt/Robot/ScreenCaptureRobotTest.java failing on macOS

[Naveen Narayanan]

This contains test fixes for the following issue in ScreenCaptureRobotTest.java

•	Failures in Mac OS because of mouse pointer visible on top of the image that is screen captured by robot.

Testing:
Tested using Mach5(100 times per platform) in MacOS, Linux, Windows & MacOS AArch64. Seen all tests passing.

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Commit messages:
 - 8344581: java/awt/Robot/ScreenCaptureRobotTest.java failing on macOS

Changes: https://git.openjdk.org/jdk/pull/23264/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23264&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344581
  Stats: 13 lines in 2 files changed: 12 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/23264.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23264/head:pull/23264

PR: https://git.openjdk.org/jdk/pull/23264