Fix #349 -- substract lists in Baker.get_fields() instead of castin…

…g to set

model_bakery/baker.py

@@ -404,7 +404,7 @@ def prepare(
         return self._make(**params)
 
     def get_fields(self) -> Any:
-        return set(self.model._meta.get_fields()) - set(self.get_related())
+        return [f for f in self.model._meta.get_fields() if f not in self.get_related()]
 
     def get_related(
         self,