[systemsettings] [Bug 408606] Font preview empty (white rectangle instead of preview)

[Yaroslav Sidlovsky]

https://bugs.kde.org/show_bug.cgi?id=408606

--- Comment #7 from Yaroslav Sidlovsky <zawertun at gmail.com> ---
Bug was caused by wrong pixel format (expected: RGB32, 0xffRRGGBB), but first
byte of pixel is not 0xFF - so white rectangle is displayed.
We need same fix as in spectacle code:
https://lxr.kde.org/source/kde/kdegraphics/spectacle/src/Platforms/PlatformXcb.cpp#0311.
I'll do PR.

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