[Merged by Bors] - style(SetTheory): remove useless parentheses #8279
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These were caused by a bad notation precedence in mathlib3, where the local version of
^
was given precedence 0. We're not using the local notation at all in Mathlib4 (partly because it was broken, which this PR fixes).Cleaning up this file now makes it easier to deal with fallout from attempts to fix leanprover/lean4#2220