fix passthrough of atranscription into kwargs going to upstream provider

Author: jpetrucciani

litellm/main.py

@@ -5362,8 +5362,7 @@ def transcription(
     proxy_server_request = kwargs.get("proxy_server_request", None)
     model_info = kwargs.get("model_info", None)
     metadata = kwargs.get("metadata", None)
-    atranscription = kwargs.get("atranscription", False)
-    atranscription = kwargs.get("atranscription", False)
+    atranscription = kwargs.pop("atranscription", False)
     litellm_logging_obj: LiteLLMLoggingObj = kwargs.get("litellm_logging_obj")  # type: ignore
     extra_headers = kwargs.get("extra_headers", None)
     kwargs.pop("tags", [])