Every entities has a `sameAs` triple in NQ

[mhoangvslev]

• Bug introduced in WatDiv where every entity, along with a type-assertion, has a sameAs triple.

[mhoangvslev]

• [x] Clean the virtuoso endpoint:

  
  PREFIX bsbm-inst: <http://www4.wiwiss.fu-berlin.de/bizer/bsbm/v01/instances/>
  PREFIX bsbm: <http://www4.wiwiss.fu-berlin.de/bizer/bsbm/v01/vocabulary/>
  PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
  PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
  PREFIX owl: <http://www.w3.org/2002/07/owl#>

DELETE WHERE { VALUES ?class { bsbm:RatingSite bsbm:Person bsbm:Review bsbm:Vendor bsbm:Offer } .

?localEntity a ?class .
?localEntity owl:sameAs ?globalEntity .

} GROUP BY ?class

- [x] Clean the `.nq` files:
```bash
sed -Ei "/Review([0-9]+)>.*sameAs/d" experiments/bsbm/model/dataset/*.nq