Hardcode icons for default plasma components

Unfortunately are components free to choose their unique component name any way
they like, that means we have no chance to reasonably map a KService/icon to a
component if its identifier is chosen badly. For presentation purposes we can
at least hardcode some icons for components that are active in a default plasma
session.
CCBUG:424197
CCBUG:424198
CCBUG:424194
CCBUG:424195


(cherry picked from commit ad97508a)