add missing virtual keyword for sqliteback::Notify func
add missing virtual keyword for sqliteback::Notify func

mbmcgarry/cyclus,rwcarlsen/cyclus,mbmcgarry/cyclus,gidden/cyclus,rwcarlsen/cyclus,Baaaaam/cyclus,hodger/cyclus,Baaaaam/cyclus,Baaaaam/cyclus,rwcarlsen/cyclus,hodger/cyclus,hodger/cyclus,gidden/cyclus,gidden/cyclus,gidden/cyclus,mbmcgarry/cyclus,hodger/cyclus,rwcarlsen/cyclus,hodger/cyclus,mbmcgarry/cyclus