[sailfish-browser] Don't add opensearches when using private mode. JB#55094 OMP#JOLLA-271
[sailfish-browser] Don't add opensearches when using private mode. JB#55094 OMP#JOLLA-271

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