MacOS windowDidBecomeKey inconsistency

[Johan Vos]

I noticed different test results when running systemtests on a mac/intel
versus an M2.
when running systemtests from a command line using

`sh gradlew --info -PFULL_TEST=true  :systemTests:cleanTest
:systemTests:test --tests=test.com.sun.javafx.tk.quantum.SystemMenuBarTest`

I traced it down to `windowDidBecomeKey` on `GlassWindow+Overrides.m` not
being called on the M2. That of course leads to different paths, hence
different test results.

I wonder if this is somehow related to
https://bugs.openjdk.org/browse/JDK-8089848. Before looking into this, is
this something others observed as well?

- Johan
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