HURD letters should stay on until the word is completed

[jgengelhardt]

Currently, a HURD letter will silently turn off if you hit it again before scoring the complete word, punishing the player. All other tables I've played elsewhere don't turn off a letter until the player either drains the ball or completes the word.

However, this behavior is clearly defined and easily adjusted in the .cpp file. When I tested this, the resulting behavior was what I expected.

[rzr]

Please confirm bug is gone