feat(trunc): simplify proof
unreachable code was reached with the old proof in some builds
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@ -303,9 +303,7 @@ namespace is_trunc
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fapply is_trunc_equiv_closed_rev, { apply eq_equiv_equiv},
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induction n,
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{ apply @is_contr_of_inhabited_prop,
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{ apply is_trunc_is_embedding_closed,
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{ apply is_embedding_to_fun} ,
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{ reflexivity}},
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{ apply is_trunc_equiv },
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{ apply equiv_of_is_contr_of_is_contr}},
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{ apply is_trunc_is_embedding_closed,
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{ apply is_embedding_to_fun},
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