message: wallet.js: consolidate: remove prevId
  This parameter also does not actually exist.
  Issue:
diff: @@ -521,7 +521,6 @@ export class Wallet {
  *
  * @param {Object} params - parameters object
  * @param {String} params.walletPassphrase - the users wallet passphrase
  - * @param {String} params.prevId - used in batch requests
  * @param {Number} params.limit - the number of unspents retrieved per call
  * @param {Number} params.minValue - the minimum value of unspents to use in satoshis/kB
  * @param {Number} params.maxValue - the maximum value of unspents to use in satoshis/kB
  