Update the name of the REQUIRED_KWARGS variable.

OpenAIChatAtomicFlow.py

@@ -23,7 +23,7 @@ log = logging.get_logger(__name__)
 
 class OpenAIChatAtomicFlow(AtomicFlow):
     REQUIRED_KEYS_CONFIG = ["model_name", "generation_parameters"]
-    REQUIRED_KEYS_KWARGS = ["system_message_prompt_template",
+    REQUIRED_KEYS_CONSTRUCTOR = ["system_message_prompt_template",
                             "human_message_prompt_template",
                             "query_message_prompt_template"]