fix err in tests

Author: bieli

src/builders/iot_ext_item_data_builder.py

@@ -67,15 +67,14 @@ def __str__(self, items_separator=",") -> str:
         return self.__prepare_msg(items_separator=items_separator)
 
     def to_json(self) -> str:
-                        Item(
-                            kind=ItemTypes.METRIC_ITEM,
-                            name=item["m"],
-                            metric=MetricDataItem(
-                                data_type=data_type,
-                                value=val,
-                            ),
-                        )
-                    )
+        Item(
+            kind=ItemTypes.METRIC_ITEM,
+            name=item["m"],
+            metric=MetricDataItem(
+                data_type=data_type,
+                value=val,
+            ),
+        )
         self.__str__()
         return IoTextItemDataBuilder.to_json_from_iotext_struct(self.output)