rename 'squiggly type a 9x9', 'squigly type b 9x9' to 'squiggly', 'squoggly'

[timo-a]

We should drop the size here as we did with x-sudoku and stairs.
I think it is unlikely that we'll expand it to other sizes
squiggly, squoggly sounds in my ears more 'friendly/less intimidating/whatever' than 'type a|b'