~/.config/st: Make yellow more readable

I use a bright background, so the really bright yellow didn't work for
that.  This makes it a bit better.

.config/st/config.h

	"#555753", //"gray50",
	"#ef2929", //"red",
	"#8ae234", //"green",
	"#fce94f", //"yellow",
	"#eddb08", //"#f4e106", //"#fce94f", //"yellow",
	"#729fcf", //"#5c5cff",
	"#ad7fa8", //"magenta",
	"#34e2e2", //"cyan",