Remove top level class check from CPONT preprocessed file

Change QC pipeline to only run top-level-class-violation.sparql against cpont.owl and not run it against the cpont-preprocess.owl file. cpont-preprocess.owl doesn't contain any imported terms (including all of the top-level classes), so any native CPONT terms will be added to cpont-preprocess.owl but won't yet be classified under a top-level term.

This addresses the QC error in !59 (merged).