Remove multiple Q-per-pg support from content partial
Remove multiple Q-per-pg support from content partial

Note that more generally `SmartAnswerPresenter#questions` can be a 0- or
1-element array, but in this case we're "inside" the `else` block for
`if ! @presenter.started?` and the `else` block of `if @presenter.finished?`
and so it will always be a 1-element array.

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