A11y: use black for schedule header to fix contrast #776
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For #682.
Before
Use primary colour (dark blue #0409e7) for schedule table headers. The ratio on the advanced #D34847 background is 2.17:1: https://webaim.org/resources/contrastchecker/?fcolor=000000&bcolor=D34847
After
Use black as the foreground colour. The ratio on the advanced #D34847 background is 4.78:1 https://webaim.org/resources/contrastchecker/?fcolor=FFFFFF&bcolor=FF0000
The other levels all remain above the WCAG AA min of 4.5:1.