[Merged by Bors] - chore(number_theory/{fermat4, sum_four_squares, zsqrtd/basic}): simplify/rearrange proofs #7866
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These are mostly cosmetic changes, simplifying a couple of proofs. I would have tagged it
easy
, but since there are three files changed, it may take just over 20'' to review!The main motivation is to reduce the diff in the bigger PR #7645.