Remove superfluous setData call

It's done by urlNavigatorHistoryAction already

src/dolphinmainwindow.cpp

@@ -810,7 +810,6 @@ void DolphinMainWindow::slotAboutToShowBackPopupMenu()
     m_backAction->menu()->clear();
     for (int i = urlNavigator->historyIndex() + 1; i < urlNavigator->historySize() && entries < MaxNumberOfNavigationentries; ++i, ++entries) {
         QAction *action = urlNavigatorHistoryAction(urlNavigator, i, m_backAction->menu());
-        action->setData(i);
         m_backAction->menu()->addAction(action);
     }
 }
@@ -839,7 +838,6 @@ void DolphinMainWindow::slotAboutToShowForwardPopupMenu()
     m_forwardAction->menu()->clear();
     for (int i = urlNavigator->historyIndex() - 1; i >= 0 && entries < MaxNumberOfNavigationentries; --i, ++entries) {
         QAction *action = urlNavigatorHistoryAction(urlNavigator, i, m_forwardAction->menu());
-        action->setData(i);
         m_forwardAction->menu()->addAction(action);
     }
 }