applet: Set statistics "RefreshRateMs" to zero once the popup dialog is closed

Ser Freemanrequested to merge
sf/plasma-nm:reset-stats-refresh-rate into master

It's not necessary to have NetworkManager keep updating statistics when popup dialog is not shown.

In PopuplDialog.qml, StackView model is set to null if mainWindow.expanded is false to make sure that ConnectionItem.qml Component.onDestruction is called before full.connectionModel is set to null.

Can be tested with Qt D-Bus Viewer by subscribing to the PropertiesChanged signal of org.freedesktop.NetworkManager.

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