Update feedback count func

[sergiopaniego]

The current extract_feedback_counts function may return numbers that are incorrect for the number of green and yellow positions. This is what how the feedback looks like for this case:

A P P L E
Y Y X X G

A P P L E
Y Y X X G

A P P L E
Y Y X X G

B E R R Y
X Y X X X

G R E E N
X X Y X X

B A R E D
X G X Y X

You have 0 guesses left.

Updating it to reflect this.

@burtenshaw