[libqtsparql] Fix tests after update to tracker-sparql-0.18
[libqtsparql] Fix tests after update to tracker-sparql-0.18

See 37f1a8d ([tracker] updated for tracker-sparql-0.18 buildrequires)

vranki/libqtsparql,vranki/libqtsparql,vranki/libqtsparql,vranki/libqtsparql