Fix -Wdeprecated-copy warning

QDBusReply has an user-specified operator= but no copy constructor.

Change-Id: If7fcec3193af375f1bf2dd913d82548d6e035b48
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/dbus/qdbusreply.h

@@ -64,6 +64,7 @@ public:
     {
         *this = reply;
     }
+    inline QDBusReply(const QDBusReply &) = default;
     inline QDBusReply& operator=(const QDBusMessage &reply)
     {
         QVariant data(qMetaTypeId<Type>(), nullptr);