Avoid updating ddbb after visiting a page in tests
Avoid updating ddbb after visiting a page in tests

The extra check to see the voter count has increased was redundant; we
already check the request has finished inside the
`vote_for_poll_via_web` method and we check all three voters are created
in the results table.

Updating the poll so it's in the past after starting the browser might
result in database inconsistencies while running the tests, so we're
using `travel_to` instead.

consul/consul,consul/consul,consul/consul,consul/consul,consul/consul