solana: Hello Token, fix recipient address in Transfer With Payload data

[a5-pickle]

Objective

Currently the encoded address is a recipient token address (strictly an associated token account). If a relayer were to redeem a transfer for this recipient, he would need to know the owner of the recipient's token account. But there is no information about the owner. The owner of the associated token account should be the address encoded in the HelloTokenMessage::Hello payload. Then the associated token account can be derived using the encoded mint and encoded recipient.

Definition of Done

• Fix invalid recipient check in in lib.rs.
• Modify SDK redeem methods to reflect the change.
• Verify tests still work.