Emit TableView::activated on return being pressed.

Change-Id: Ia0bf6e0ef5cfaabcf0ff4e588a629b49155222bc
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>

src/qtdesktop/TableView.qml

@@ -362,6 +362,8 @@ FocusScope{
                 verticalScrollBar.value = verticalScrollBar.value + tree.height
         }
 
+        Keys.onReturnPressed: root.activated();
+
         onContentYChanged:  {
             scroller.blockUpdates = true
             scroller.verticalValue = tree.contentY