bug: Unreasonable InsufficientFunds error

[nuttycom]

Reported by @LukasKorba

▿ ZcashError
  - rustCreateToAddress : "Error while sending funds: Insufficient balance (have 9422794, need 165000 including fee)"

A likely culprit is incorrect handling of dust inputs in https://github.com/zcash/librustzcash/blob/main/zcash_client_backend/src/fees/zip317.rs#L118-L145 - if there exists a condition here where excessive dust inputs are being selected, even though the non-dust inputs are sufficient to pay for a transaction, then this could result in an InsufficientFunds error as a consequence of the test here: https://github.com/zcash/librustzcash/blob/main/zcash_client_backend/src/data_api/wallet/input_selection.rs#L478-L487

[nuttycom]

Fixed in #1312, real fix postponed to #1316