chore: restore @[simp] to upstreamed Nat.lt_off_iff #5503
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This was upstreamed from Mathlib in #5478, but leaving off the
@[simp]attribute, thereby breaking Mathlib. (We could of course add the simp attribute back in Mathlib, but wherever it lives it should have been in place at the time we merged -- this way I have to add it temporarily in Mathlib and then remove it again once it is redundant.)