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