fix(account-tree-controller): fix AccountWallet type

[gantunesr]

Explanation

Use proper type metadata type for AccountWallet.

References

N/A

Changelog

N/A

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

Re-approving after merging main back.