Remove webcam capture approval button (checkmark)

As per @andywaldrop's request, this removes the webcam capture approval button (i.e., the checkmark) from the webcam photo view. Capturing a photo now automatically saves the data to the verification model and enables the submit button.

@wedaly and @AlasdairSwan, could you review this when you're able?

I noticed while removing the checkmark that the breadcrumb at the top of the page doesn't update as the user proceeds through the verification flow. This behavior is present in master, so this branch hasn't introduced a regression. I think resolving this issue is separate from the removal of the checkmark, so a fix isn't included in this PR.