The San Francisco 49ers were always going to start Jimmy Garoppolo at quarterback for their Week 1 matchup against the Lions. Niners head coach Kyle Shanahan didn’t make such a commitment public, but all the evidence pointed to that being the case. But now the Niners have no choice but to start Garoppolo in Week 1, as Trey Lance has a chipped finger on his throwing hand, which will keep him out of practice for at least a week. The injury — which came when Lance hit a Raiders defender’s helmet in the first half of the Niners’ preseason finale Sunday — is a reminder that, for all the hand wringi…