Reverse test expectation for local_expm1 rewrite

With the new `local_add_neg_to_sub` rewrite a previously missed case is now also detected

tests/tensor/test_math_opt.py

@@ -3972,7 +3972,7 @@ def test_local_expm1():
         for n in h.maker.fgraph.toposort()
     )
 
-    assert not any(
+    assert any(
         isinstance(n.op, Elemwise) and isinstance(n.op.scalar_op, aes.basic.Expm1)
         for n in r.maker.fgraph.toposort()
     )