override + reorder some functions

src/qwaylandxdgactivationv1_p.h

@@ -21,12 +21,15 @@ class QWaylandXdgActivationTokenV1
 {
     Q_OBJECT
 public:
+    ~QWaylandXdgActivationTokenV1() override {
+        destroy();
+    }
+
+protected:
     void xdg_activation_token_v1_done(const QString &token) override {
         Q_EMIT done(token);
     }
-    ~QWaylandXdgActivationTokenV1() {
-        destroy();
-    }
+
 Q_SIGNALS:
     void done(const QString &token);
 };