applet: directly set switching sizes
The volume applet currently reads the minimum size for switching to full representation from the Layout. This does not work in a panel though, because the applet is not in a layout, and the fullRepresentation is not loaded so the Layout properties set there can't be used for this either.
This change sets the switching values explicitly (in multiples of gridUnit) and has the fullRepresentation set the Layout properties based on those, rather than the other way around. This is how similar applets do it (e.g. webbrowser or mediacontroller), and restores Plasma 5 functionality.
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