remove wrong TODO

Author: assaf127

sdks/python/apache_beam/coders/coder_impl.py

@@ -351,7 +351,7 @@ def decode(self, value):
 ITERABLE_LIKE_TYPE = 10
 
 PROTO_TYPE = 100
-DATACLASS_TYPE = 101  # TODO: Deprecate and use only DATACLASS_KW_ONLY_TYPE.
+DATACLASS_TYPE = 101
 NAMED_TUPLE_TYPE = 102
 ENUM_TYPE = 103
 NESTED_STATE_TYPE = 104