Doc: Update source code for deleting alarms

Rewrote delete statement in AlarmDelegate.qml

Change-Id: Ib112103c0666a6bce34576da5f38594ceac14788
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

examples/tutorials/alarms/AlarmDelegate.qml

@@ -136,7 +136,7 @@ ItemDelegate {
             width: 40
             height: 40
             visible: root.checked
-            onClicked: alarmModel.remove(alarmListView.currentIndex, 1)
+            onClicked: root.ListView.view.model.remove(root.ListView.view.currentIndex, 1)
         }
     }
 }

examples/tutorials/alarms/main.qml

@@ -64,7 +64,7 @@ ApplicationWindow {
     ListView {
         id: alarmListView
         anchors.fill: parent
-        model: AlarmModel { id: alarmModel }
+        model: AlarmModel {}
         delegate: AlarmDelegate {}
     }