In the "Settings" Tab, change the way to have a Switch to resolve an anckors-row conflict

Hello again,

In your "Settings" tab, you have a Switch to show/hide hints, you have coded that with a row and a Label and a Switch. This result on an error:
"file:///home/helion/DOC/sudoku-app/sudoku-app.qml:314:21: QML Row: Cannot specify left, right, horizontalCenter, fill or centerIn anchors for items inside Row. Row will not function."
The solution is to use a "ListItem.Standard" and a "control" (see file:///usr/share/ubuntu-ui-toolkit/doc/html/qml-ubuntu-components-listitems0-standard.html)

Here what should be done according to me:

        ListItem.Standard {
            //TRANSLATORS: context here
            text: i18n.tr("label")
            control: Switch {
                id: switchId
                anchors.horizontalCenter: parent.horizontalCenter
                anchors.verticalCenter: parent.verticalCenter
                checked: true
                onCheckedChanged: {
                    print("Hello World!");
                }
            }
        }

This will resolve anckors-row issues.

Thanks again for your app.