fix(manifest): Remove old model.owl

test/model.owl

-@prefix : <http://loutre.fr/>.
-@prefix owl: <http://www.w3.org/2002/07/owl#>.
-@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
-@prefix xsd: <http://www.w3.org/2001/XMLSchema#>.
-
-:FirstClass a owl:Class.
-
-:SubClass a owl:Class;
-    rdfs:subClassOf :FirstClass.
-
-:toto a owl:DatatypeProperty;
-    rdfs:domain :FirstClass;
-    rdfs:range xsd:int.