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qt: do not use `Screen.devicePixelRatio` as it is invalid on Wayland with fractional scale

Fatih Uzunoğlu requested to merge fuzun/vlc:qt/dontusescreendpr into master

It reports 2.0 in my case, while effective device pixel ratio of the attached window is 1.25 (matches my display scale).

I think this happens because Wayland needs fractional scale protocol and that is bound to a wayland surface (Qt window) and not screen. Qt uses fractional scaling protocol for windows as I can get it properly with QQuickWindow::(effective)devicePixelRatio().

Request review @chub.

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