fix(cpp-qt-client): add asJsonObject method to OAIEnum class to fix enum handling in query parameters

Author: ReallyVirtual

modules/openapi-generator/src/main/resources/cpp-qt-client/enum.mustache

@@ -5,6 +5,7 @@
 #include <QJsonValue>
 #include <QMetaType>
 #include <QString>
+#include <QJsonObject>
 
 {{#cppNamespaceDeclarations}}
 namespace {{this}} {
@@ -27,6 +28,12 @@ public:
     virtual QString asJson() const {
         return jstr;
     }
+    
+    virtual QJsonObject asJsonObject() const {
+        QJsonObject obj;
+        obj["value"] = jstr;
+        return obj;
+    }
 
     virtual void fromJson(QString jsonString) {
         jstr = jsonString;