RFR: 8289606: CustomSecurityManagerTest fails on Mac M1

[Kevin Rushforth]

On Wed, 13 Jul 2022 19:48:21 GMT, Andy Goryachev <duke at openjdk.org> wrote:

> - sampling at 1/3 of screen height instead of the very top to avoid hitting OS UI found on the newer Macs with a notch
> - change applies to all platforms

Given what this test is trying to test, the proposed fix seems fine. I confirm that this test fails on my Mac M1 without the fix and passes with the fix.

One thing I just spotted is that this test makes the same mistake as `MouseLocationOnScreenTest -- see [JDK-8289611](https://bugs.openjdk.org/browse/JDK-8289611) -- in that it uses the bounds rather than the visual bounds of the screen. You can either look into that as well, or leave it as a fix for another day.

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Marked as reviewed by kcr (Lead).

PR: https://git.openjdk.org/jfx/pull/826