Adapt to Ayatana Power Indicator changes
There has been a change in the Ayatana Power Indicator and the org.ayatana.indicator.progress
menuitem type:
The battery charge has been previously connected to action-state
changes, but now we are simply passing the x-ayatana-progress
attribute with a guint16
value whenever the menu item needs an update.
It seems to me that the code that needs tweaking on the Lomiri side starts here: https://gitlab.com/ubports/development/core/lomiri/-/blob/main/qml/Panel/Indicators/IndicatorMenuItemFactory.qml#L74