Simplify the LoKi::HDRFilter logic

In Moore, the DecReports are produced in an effectively random location. The HDRFilter used to check for Hlt1 or Hlt2 in the location name, which then always fails.

This MR removes all of these name-based checks from the algorithm, and tidies up the implementation to allow for an easier transition to something simpler.

Required for Moore!646 (merged).