修正Replace的Detach方法，原实现在detach该session后，触发END时间时导致段错误

plugin/business/pangu-http/src/pangu_http.cpp

@@ -585,6 +585,7 @@ void http_replace(const struct tfe_stream * stream, const struct tfe_http_sessio
 	if (to_write_sess == NULL)    //fail to wirte, abandon.
 	{
 		TFE_STREAM_LOG_INFO(stream, "tfe_http_session_allow_write() %s failed.", session->req->req_spec.uri);
+		ctx->action = PG_ACTION_NONE;
 		tfe_http_session_detach(session); return;
 	}
 
@@ -602,6 +603,7 @@ void http_replace(const struct tfe_stream * stream, const struct tfe_http_sessio
 		else
 		{
 			TFE_STREAM_LOG_INFO(stream, "Can only setup replace on REQ/RESP headers, detached.");
+			ctx->action = PG_ACTION_NONE;
 			tfe_http_session_detach(session); return;
 		}
 	}