chore: remove unused simp arguments in SuccSuccAbove

[nateabr]

#1701 removed import Mathlib.Data.Nat.SuccPred from SuccSuccAbove.lean, which left two unused
simp arguments at line 284. Their warnings fail the CI build for open PRs (for example #1702).
This removes them.

The PR was completely AI generated

[github-actions]

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[zhikaip]

Apologies, I'm not sure why the CI checks didn't catch that. Will approve and merge now