Fix Look Ahead Gene mutation
Fix Look Ahead Gene mutation

This gene is the only one with a mix of Interpolated Gene Values and
plain Gene Values. Because the interpolated values have two mutable
components, they need to be mutated twice as often.

MarkZH/Genetic_Chess,MarkZH/Genetic_Chess,MarkZH/Genetic_Chess,MarkZH/Genetic_Chess,MarkZH/Genetic_Chess