Update interest calculation for collateral custodies

[mzs-dev]

Don't think this fixes the issue with misappropriated computation of interest. The proposed change here: https://github.com/askibin/perpetuals-fork/blob/86c3f3498019807a89df9f54ab85be76008812dc/programs/perpetuals/src/state/custody.rs#L497-L498 does account for proper tracking of interest accrued on collateral custody in case of shorts or virtual asset positions. However we're computing the wrong interest amount in case of shorts here: https://github.com/askibin/perpetuals-fork/blob/86c3f3498019807a89df9f54ab85be76008812dc/programs/perpetuals/src/state/custody.rs#L444 and updating the stats here: https://github.com/askibin/perpetuals-fork/blob/86c3f3498019807a89df9f54ab85be76008812dc/programs/perpetuals/src/state/custody.rs#L453 Which is included in pool aum calculations here: https://github.com/solana-labs/perpetuals/blob/2b715801f5531c7d75800acfe1e9f25c18d20700/programs/perpetuals/src/state/pool.rs#L756-L799

[askibin]

agree, the interest was counted twice for shorts/virtual, in both custody and collateral_custody, updated

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Name	Status	Preview	Comments	Updated (UTC)
perpetuals	❌ Failed (Inspect)			Aug 1, 2023 9:44pm