Invalid, explicit check not required. listOffer is for subsequent makers that want to sell points again. Based on the original maker creating offer as seen [here](https://github.com/Cyfrin/2024-08-tadle/blob/04fd8634701697184a3f3a5558b41c109866e5f8/src/core/PreMarkets.sol#L137-L138), if offerType is ASK, the stockType will default to Bid type, so the check [here](https://github.com/Cyfrin/2024-08-tadle/blob/04fd8634701697184a3f3a5558b41c109866e5f8/src/core/PreMarkets.sol#L330-L332) is sufficient in ensuring only ask offer can be listed
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