[runners/windowedwidgets] Make the nature of matches more clear
It may not be obvious to the user that these search results are actually Plasma applets and not standalone apps--especially when a search result appears in Kickoff, which does not display the runner providing each match, as KRunner does.
So let's make this a bit more clear by appending "(Plasma widget)" to the end of each matched item.
BUG: 433644 FIXED-IN: 5.22
These are no longer so confusing to see at the same time: