[jdk25u-dev] RFR: 8357390: java/awt/Toolkit/ScreenInsetsTest/ScreenInsetsTest.java Test failing on Ubuntu 24.04 Vm Hosts used by Oracle's internal CI system

[Roland Mesde]

Backporting JDK-8357390: java/awt/Toolkit/ScreenInsetsTest/ScreenInsetsTest.java Test failing on Ubuntu 24.04 Vm Hosts used by Oracle's internal CI system.

This PR increases the acceptable margin from 1px to 2px to accommodate the Ubuntu 24.04 window manager quirk..

For parity with Oracle JDK.

Ran related tests on linux-x64 (Ubuntu 24.04), linux-aarch64 (Ubuntu 24.04), macos-aarch64 and windows-x64:

make test TEST=test/jdk/java/awt/Toolkit/ScreenInsetsTest/ScreenInsetsTest.java

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Commit messages:
 - Backport c2fde517b44e2315385a5ffe17fcf9ab57e12786

Changes: https://git.openjdk.org/jdk25u-dev/pull/257/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=257&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357390
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/257.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/257/head:pull/257

PR: https://git.openjdk.org/jdk25u-dev/pull/257