WelcomeScreen: Re-add lost hover-state on tabs

Change-Id: I373544cd1fc6ad3b1518571f0a4c36ea160e9600
Reviewed-on: http://codereview.qt.nokia.com/3340

Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

share/qtcreator/welcomescreen/widgets/LinksBar.qml

@@ -69,6 +69,10 @@ Row {
                 onClicked: tabBar.current = index
             }
             states: [
+                State {
+                    id: hoverState; when: mouseArea.containsMouse && tabBar.current != index
+                    PropertyChanges { target: tabBackground; source:"qrc:welcome/images/tab_hover.png" }
+                },
                 State {
                     id: activeState; when: tabBar.current == index
                     PropertyChanges { target: tabBackground; source:"qrc:welcome/images/tab_active.png" }