Fix macOS menu at launch

[alblue]

When a Java application launches, the menu is not immediately clickable. A
recent change in macOS broke the functionality used before, which calls
activateWithOptions outside of the applicationDidFinishLaunching delegate
call.

As per https://stackoverflow.com/questions/62739862 this can be fixed by
moving the activateWithOptions calls into the delegate's callback.

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Progress

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Download

$ git fetch https://git.openjdk.java.net/jfx pull/386/head:pull/386
$ git checkout pull/386

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[alblue]

NB I've tried to build/test this locally but wasn't successful. I'm also aware this may not be the appropriate way of fixing this for the JavaFX project. This is an alternate approach to pull #361 and based off the prior commit, though if this goes ahead I would expect that pull #361 changes are reverted, then this rebased on top of head. /cc @kevinrushforth

[kevinrushforth]

I finally got a chance to try this, and it didn't work for me. If I locally revert the deactivation / reactivation changes from PR #361 and apply the proposed fix from this patch, the menu bar is back to being non-responsive until you switch away from the app and switch back. Given the the way JavaFX is launching the macOS application, it seems it isn't sufficient to move the activation to applicationDidFinishLaunching.