Stellarium / stellarium / 28213948115

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Use the same rounding for window size as Qt does

When using high-DPI scaling, Qt simply rounds down (truncates) physical
window size (see the uses of q->devicePixelRatio() in
qopenglwindow.cpp). So should we do to match its behavior. Conversely,
when computing the virtual size, we should round up.

Fixes #5007

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