Add option for when an error sound should play

[owo]

At the moment, when you enable the option to play a sound on error, a sound is played once for each time you input an incorrect letter and then again after you click space (i.e. go to the next word) if you haven't corrected all the mistakes in the current word.

I find that last error sound a bit annoying as it makes it seem you mistyped an incorrect letter yet again. It would be nice if there was an option to disable it.

I am willing to work on this myself if it's something the maintainers are willing to include.