fix: use correct account id for matching buy account

[kaladinlight]

Description

Do not use the sellAssetAccountId for deriving buyAccountId, but instead derive maybeMatchingBuyAccountId using the same account number as the sell asset. This ensures we use the correct matching accountId for the buy asset and are able to generate a receive address and subsequently trade quotes.

Regression: #6229

Follow up issue: #6262

Pull Request Type

• 🐛 Bug fix (Non-breaking Change: Fixes an issue)
• 🛠️ Chore (Non-breaking Change: Doc updates, pkg upgrades, typos, etc..)
• 💅 New Feature (Breaking/Non-breaking Change)

Issue (if applicable)

N/A - prod issue

Risk

High Risk PRs Require 2 approvals

Medium - logic changes what buy account is used for the trade

What protocols, transaction types or contract interactions might be affected by this PR?

All trades

Testing

• Ensure you can now get quotes for cross chain swaps

Engineering

☝️

Operations

☝️

Screenshots (if applicable)

[gomesalexandre]

Tested locally:

• Matching account selection is sad again, though this isn't the guts of this PR fixing cross-chain trades:

• Cross-chain quotes are happy again