Fix typos and simplify code

Few minor fixes and simplifications I made while reading the project source code.

There seem to be a few hlint suggestions: https://gitlab.haskell.org/jhrcek/ghcup-hs/-/jobs/774123#L599

Seems like CI is downloading latest version of hlint (3.3.2) which was released yesterday and the existing code triggers this new suggestion to eta-reduce local definitions under where. Do you want me to apply the hints or add those suggestions to ignore list in .hlint.yaml?

added 1 commit

• f6b6b36e - Apply hlint 3.3.2 suggestions

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merged