qt: fix saved interface window states are not respected on start (DirectComposition)

Unfortunately, this was missed in 90471d6e (!6595 (merged)). I'm sorry for that.

Request review @chub.

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added 91 commits

• f55cfac8...366474b5 - 90 commits from branch videolan:master
• 6c082601 - qt: use `QWindow::setVisible()` instead of `QWindow::show()` in CompositorDirectComposition

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merged