Distributions pull in JavaFx `-win` artefacts even on macOS

[petebankhead]

If I run

./gradlew assemble

on macOS then I find that logviewer-app/build/distributions/logviewer-app-0.2.0.tar contains JavaFX artefacts for both macOS and Windows, i.e. javafx-base-20-win.jar and others are included unnecessarily.

I noticed this when using ./gradlew copyDependencies with an extension that had qupath-fx-gui as an implementation dependency.