fixHeaderDefaultApi.patch

--- DefaultApi.h	2024-08-29 17:22:20.027445625 +0200
+++ DefaultApi_corrected.h	2024-08-29 16:56:11.812061100 +0200
@@ -38,8 +38,6 @@
 namespace server {
 namespace api {
 
-using namespace org::openapitools::server::model;
-
 ///
 /// Exception to flag problems in the handlers
 ///