Date Picker Spin Button Example icons fail in WHCM

[carmacleod]

Date Picker Spin Button Example triangles fail contrast.

The grey triangles (fill: #333) need to be changed to fill: currentColor (ok to keep the stroke transparent, because that lets the triangle "grow" when the user hovers over it).

The blue triangles (fill&stroke: #005a9c) need to have both their fill and stroke changed to currentColor.

Here's a screen snap of WHCM Black, showing the Color Contrast Analyzer failing non-text contrast for the grey triangles.