RFR: 7124313: [macosx] Swing Popups should overlap taskbar

[Prasanta Sadhukhan]

In macos, popups does not overlap taskbar unlike windows, as can be seen here  
in "Settings"
so we can omit this test from macOS run.

![image](https://urldefense.com/v3/__https://user-images.githubusercontent.com/43534309/175878607-6435da8c-ae32-4512-9cbc-0b449637e93f.png__;!!ACWV5N9M2RV99hQ!PSbIus5gdNAdguS0ywCmpN44iRfQQtdjL5boscGU5AyxhOJdQbpokUwhEahODsh1whMPKxgOGNpwBOgl7LNyMaas7zTC9g$
 )

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Commit messages:
 - 7124313: [macosx] Swing Popups should overlap taskbar

Changes: https://git.openjdk.org/jdk/pull/9294/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9294&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-7124313
  Stats: 15 lines in 2 files changed: 10 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/9294.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9294/head:pull/9294

PR: https://git.openjdk.org/jdk/pull/9294