Add BPVCORRM functor in test which compares ThOr and Loki functors

Giulia Tucirequested to merge
gtuci/test_corrm_functor into master

The BPVCORRM() functor is added to the loki_comparison.py test. In this way the changes applied in Rec!2568 (merged) can be tested.

cc @mvesteri @agilman @chasse

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