lib/db: Fix benchmarks
lib/db: Fix benchmarks

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4708

rumpelsepp/syncthing,wweich/syncthing,wweich/syncthing,imsodin/syncthing,xduugu/syncthing,wweich/syncthing,syncthing/syncthing,imsodin/syncthing,rumpelsepp/syncthing,imsodin/syncthing,imsodin/syncthing,AudriusButkevicius/syncthing,uok/syncthing,xduugu/syncthing,xduugu/syncthing,xduugu/syncthing,AudriusButkevicius/syncthing,wweich/syncthing,AudriusButkevicius/syncthing,uok/syncthing,syncthing/syncthing,imsodin/syncthing,syncthing/syncthing,syncthing/syncthing,uok/syncthing,rumpelsepp/syncthing,syncthing/syncthing,syncthing/syncthing,rumpelsepp/syncthing,AudriusButkevicius/syncthing,uok/syncthing