chore: change simp default to decide := false #2166
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In #1888 we turned off
decide := true
as the default behaviour indsimp
.I think at the time my intent had been to turn this off in
simp
as well, but that's not what the PR did.Since then issue #2068 (see also related zulip thread) requested that we turn it off in
simp
as well.I will compile mathlib against this PR in case of regressions there.