Run configlet fmt to normalize configs

[kytrinyx]

This normalizes exercise configs, which should help
reduce noise in other PRs later.

[kytrinyx]

@jiegillet I noticed that #151 was changing some exercise configs that were unrelated to the exercise being added.

Unfortunately configlet fmt doesn't format the top-level config, so I grabbed the reformatted file from your isogram PR (#151), and removed the bit about isogram.

[lpil]

Thank you. Is a particular tool used for this?

[jiegillet]

For the exercise config the tool is bin/configlet fmt --update --yes.

For the top config, the generator script I use rewrites the config via jq, which also formats the file. Actually there is one annoying side effect/bug, the "average_run_time": 3.0 always gets transformed to to "average_run_time": 3 but the Exercism tool using this value requires an float. Haven't found a nice fix for that yet.