fix: do not add filters to non list fields

Thanks to @g-as for reporting this regression from the last release.

strawberry_django/filters.py

@@ -188,6 +188,9 @@ def arguments(self) -> List[StrawberryArgument]:
                 and self.origin._type_definition.name == "Query"
             ):
                 arguments.append(argument("pk", strawberry.ID, is_optional=False))
+            elif self.django_model and not self.is_list:
+                # Do not add filters to non list fields
+                pass
             elif filters and filters is not UNSET:
                 arguments.append(argument("filters", filters))
         return super().arguments + arguments

tests/filters/test_filters.py

@@ -252,7 +252,11 @@ def test_enum(query, fruits):
 
 @pytest.mark.django_db(transaction=True)
 def test_pk_inserted_for_root_field_only():
-    @strawberry_django.type(models.Group)
+    @strawberry_django.filters.filter(models.Group)
+    class GroupFilter:
+        name: str
+
+    @strawberry_django.type(models.Group, filters=GroupFilter)
     class GroupType(models.Group):
         name: strawberry.auto