[sailfish-browser] Remove default search engine guard. Fixes JB#32815
[sailfish-browser] Remove default search engine guard. Fixes JB#32815

It's enough to check that search engines has been initialized.

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