fix formatting

Author: ericsson49

tests/generators/compliance_runners/state_transition/aspects/builder/builder.py

@@ -64,7 +64,7 @@ def has_pending_withdrawals(b: Builder) -> bool:
 
 @constraint
 def builder_constraints(b: Builder) -> None:
-    assert not is_self_builder(b) == is_external_builder(b)
+    assert is_self_builder(b) != is_external_builder(b)
 
     if is_self_builder(b):
         return