Revert "fix fractional scaling"

Authored by cullmann on Oct 9 2019, 2:05 PM.

Description

Revert "fix fractional scaling"

This reverts commit 769b6e17a0a1e46777ddc87ef1cc9ce3e8807a16.

CCBUG: 412738

devicePixelRatioF seems to be a bad idea for QPixmap, thought I can't reproduce
the crashs here

Details