Clear wrong letters

[DanielCliftonGuardian]

What are you changing?

Why?

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Latest commit: 2ff0dd6

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[SiAdcock]

Three reasons users have said they'd prefer us to clear incorrect letters instead of striking them out:

1. The contrast of the strikethrough is hard to get right. Too much contrast and it obscures the letter. Too little and it is too feint for some users to discern. Some users are already struggling with this.
2. if you have a lot of crossed out letters and only one or two that are correct, it's really hard to distinguish. There's a lot of visual noise. (see screenshot)
3. leaving the letters in place means users have a harder time "imagining" a different word in that space. They have to manually delete the letters, which is a bit of a drudge when you're just trying to relax / have fun.