chore: add minimization for 'dsimp at' issue #4198
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This is a failure of automation minimized from
Mathlib.Algebra.Category.GroupCat.Adjunctions.Here
dsimp at *is not successfully reducing a projection of a constructor,while
dsimp at xsucceeds.In this particular example it doesn't really matter,
but in more complicated examples this then prevents lat 8000 er simp lemmas firing,
and requires manual work.