Fix Opponent Pieces Targeted Gene
Fix Opponent Pieces Targeted Gene

Gene would always skip En Passant moves due to them returning false for
Piece::can_capture() (due to that method being used for checking if the
king was attacked).

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