css: always get default font size in pixels
Fixes a couple bugs... - Pixel font sizes in css would render as point sizes. - For em font sizes, where the parent size was set and not default, we would incorrectly convert a pixel value from points to pixels. We'll always grab the default font size in pixels so we don't keep confusing things. Worth noting that gtk css font-size will still behave differently than the web. Pango interprets font-size differently.
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