PatternShape stripe description seems to be mixed up between ascending and descending

[bvenn]

When applying a striped pattern to e.g. AreaCharts I tried to add it by setting the FillPatternShape

Chart.Area([1,1;2,2;3,1],FillPatternShape=PatternShape.DiagonalDescending)

The resulting pattern however is diagonal ascending instead of descending.

I assume it got mixed up at:

Plotly.NET/src/Plotly.NET/CommonAbstractions/StyleParams.fs

Lines 2536 to 2537 in 56cc563

	| DiagonalDescending -> "/"
	| DiagonalAscending -> """\"""