Fix build without features.animation

This has been broken since 359616066e.

Change-Id: I9428bf4e1bca3f10c59a7ea334e6bb7e43c4e020
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

src/widgets/widgets/qtabbar_p.h

@@ -198,7 +198,7 @@ public:
         }
 #else
         void startAnimation(QTabBarPrivate *priv, int duration)
-        { Q_UNUSED(duration); priv->moveTabFinished(priv->tabList.indexOf(*this)); }
+        { Q_UNUSED(duration); priv->moveTabFinished(priv->tabList.indexOf(this)); }
 #endif // animation
     };
     QList<Tab*> tabList;