Reward Center Offer Public Buy (Not Private Buy)

[Kyle Espinola]

Issue

When computing the trade state on reward center offers the indexer is computing private buy trade states but the program issues public buy (aka offers on the NFT). This is leading to the wrong trade state being saved on the record.

https://github.com/holaplex/indexer/blob/dev/crates/indexer/src/geyser/accounts/hpl_reward_center/offer.rs#L100

Fix

Save public_buy trade state.