chg: [internal] Simplify SharingGroup::checkIfAuthorisedToSave
chg: [internal] Simplify SharingGroup::checkIfAuthorisedToSave

SteveClement/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP,MISP/MISP,MISP/MISP,SteveClement/MISP,MISP/MISP,MISP/MISP,SteveClement/MISP