Avalonia: fix HiDPI/Retina scaling for embedded window on macOS.

V380-Orirequested to merge
v380ori/ryujinx:ava/retina-scaling into master

This MR fixes an Avalonia regression first noticed in 11.2.5 version.

For some reason, MainWindow.OnScalingChanged no longer sets Program.DesktopScaleFactor to 2.00 on HiDPI/Retina displays, which results in a pixelated look and defeats the purpose of bilinear scaling.

If I had to guess, Avalonia probably changed the behavior of OnScalingChanged, which is not called on initialization. Either way, this fix works.

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