bug: emphasized button color in evening horizon

[goodefroi]

Dear maintainers,

for Evening Horizon, the background color of the emphasised button is set to the SAP brand color.
I do believe this is a bug and that the color should actually be equal to @sapHighlightColor or @sapPrimary2 (these are identical - I'm not too familiar with the entire design system; what matters to me is that it ends up being #4db1ff instead of #0070f2).

I also do believe that this bug wasn't spotted previously because @sapHighlightColor and @sapBrandColor are identical for Morning Horizon - but they aren't for Evening Horizon.