membership test: use Membership.__eq__()

tests/unit/wot/test_membership.py

@@ -146,5 +146,4 @@ def test_generate_membership_document():
         signing_key=signing_key,
         currency=currency,
     )
-    # Direct equality check can be done without raw() once Membership.__eq__() is implemented
-    assert expected.raw() == generated_membership.raw()
+    assert expected == generated_membership