message: fix(account-lib): add hash to signable
  TICKET:
diff: @@ -304,7 +304,7 @@ export class Transaction extends BaseTransaction {
  if (!this._nearTransaction) {
  throw new InvalidTransactionError('empty transaction');
  }
  - return Buffer.from(nearAPI.utils.serialize.serialize(nearAPI.transactions.SCHEMA, this._nearTransaction));
  + return Buffer.from(this.getTransactionHash());
  }
  /**
  