outputconfigurationstore: Prefer integer scaling over ever so slightly fractional

Kai Uwe Broulikrequested to merge
work/kbroulik/closest-scale into master

Integer scaling has several advantages, for example Qt's backing store being able to scroll contents and filling in a gap rather than having to repaint the entire region.

Instead of choosing ever so slightly fractional scaling, like 1.95 or 2.05, use integer 2.0.

My 24" 4K monitor defaulted to 1.95x which was a bit weird

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