Port locations runner away from deprecated methods & cleanup

- Do not use deprecated RunnerContext::type()
- Write the url always in the data, this way we don't
  need to do all the parsing twice.
- The concept of the case insensitive search does not make
  sense in this runner. If the user want to have case insensitive
  file search the baloo/recent docs/places runners should be used.
- Do not show a match when we are sure the file does not exist. This would
  only show a KIO error message when launching it, consequently there is
  no point in showing the message in the first place.