Remove extra path from half rate menu70X

The path HLT_HT360_SingleDisplacedPFJet60 was included by mistake in the so-called half-rate HLT menu.
This PR removes it from the menu as integrated in the 70X CMSSW, in order to facilitate the work of those making studies with that menu.
Moreover, a more meaningful name was given to a ESProducer, hltIter4ESPPixelLayerPairs renamed as hltIter4ESPPixelLessLayerPairs, with no change in its functionality though.