applet: port away from contextMenu and use contextualActionsModel
With changes to ExpandableListItem in frameworks/plasma-framework!491 (merged), we can now define both contextual actions and a custom content view. This means we can put the actions that are currently in the context menu in the contextual actions list instead, so they will be displayed in the expanded view above the custom content.
This yields several benefits:
- Makes these items more consistent with other expandable list items in other widgets
- Removes the use of a context menu, which goes against the purpose of this component (to be fully usable with only left-clicks or touches) and half of whose items were redundant
- Removes a PlasmaComponents2 import
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