Bump the mini player window on opening

[uiryuu]

• I have read CONTRIBUTING.md
• This implements/fixes issue Window location descends with each invocation #4399 .

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Description:
Manually bump up the mini player window position on opening when the video view is hidden by the height of the video view.

[low-batt]

I pulled the PR and tested a lot. This definitely greatly improves the behavior.

I'm approving it based on that testing. However…

This code seems like a workaround for bad code in MiniPlayerWindowController? I investigated a tiny bit when I was entering the issue. From what I recall the method normalWindowHeight was being called and isVideoVisible was still set to its default value of true. It seemed like the root cause of the problem had to do with that property not being set to its proper value soon enough.

The other issue here is proper separation of concerns. IINA needs to be slowly refactoring code into the appropriate classes. I think PlayerCore has to direct the transition between the main and mini windows. But I would expect a window's frame to be fully under the control of the associated NSWindowController.

[uiryuu]

I've tried to set normalWindowHeight according to Preference.bool(for: .musicModeShowAlbumArt) but that doesn't solve the problem. I agree that this seems like a workaround; if you think this is too workaround to be merged, we can close it and find a better solution.