fix: preserve PNG transparency in chat wallpapers#367
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Remove .forceOpaque = true from ChooseFromFile in settings_chat.cpp and BackgroundBox::chooseFromFile in background_box.cpp, which was compositing transparent pixels against white via Opaque() for all non-JPEG files before the image reached the wallpaper pipeline.
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Respect the user's chosen image as-is without forcing opacity, which naturally enables transparent chat background support.
closes #361
Upstream PR: telegramdesktop#30698