[tabmodel] Always clear tabs upon getting new tab list from DB
[tabmodel] Always clear tabs upon getting new tab list from DB

sailfishos/sailfish-browser,sailfishos/sailfish-browser,alinelena/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser,alinelena/sailfish-browser,alinelena/sailfish-browser,sailfishos/sailfish-browser,alinelena/sailfish-browser