adjust relevance of kcms in service runner

kcms are handy but not nearly as handy as an actual application. this is particular notable with the test case where the user could type 'virt' but that previously wouldn't have pushed virtualization software to the top but kcms since kcms are kde things so they always get a .09 bump to relevance.

the revised scoring excludes kcms from the bump and further reduces the relvance by the tiniest fraction. this results in all applications that match at least as well as the KCM to outscore the KCM