Fix ansi-to-html background color regression (#3019)
Fix ansi-to-html background color regression (#3019)

Fixes a regression where the background style would be shown as foreground
mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer