chore: fix test

Author: leodemoura

tests/lean/run/grind_offset.lean

@@ -77,8 +77,6 @@ trace: [grind.assert] foo (c + 1) = a
 [grind.assert] ¬a = g (foo b)
 [grind.ematch.instance] foo.eq_3: foo b.succ.succ = g (foo b)
 [grind.assert] foo (b + 2) = g (foo b)
-[grind.assert] c + 1 = b + 2
-[grind.assert] ¬c + 1 = b + 2
 -/
 #guard_msgs (trace) in
 example : foo (c + 1) = a → c = b + 1 → a = g (foo b) := by