Fix schema union not generated for input/output

Author: fjtirado

custom-generator/src/main/java/io/serverlessworkflow/generator/AllAnyOneOfSchemaRule.java

@@ -188,7 +188,7 @@ public JType apply(
           throw new IllegalStateException(ex);
         }
       }
-      schema.setJavaTypeIfEmpty(javaType);
+      schema.setJavaType(javaType);
     }
     return javaType;
   }