deck.reviewed_at not updated

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This line: https://github.com/dashed/grokdb2/blob/31e6ecb5dd16cf6194ff1bc4f61d51aa9fbd3164/src/tables.rs#L122

Gameplan:

• Refactor point: https://github.com/dashed/grokdb2/blob/31e6ecb5dd16cf6194ff1bc4f61d51aa9fbd3164/src/api/review.rs#L224-L243
• commit_on_deck(&self, context: Rc<RefCell<Context>>, deck_id: DeckID) -> Result<(), RawAPIError>
• commit_on_card(&self, context: Rc<RefCell<Context>>) -> Result<(), RawAPIError>

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done.