message: fix(core): fix tss pending approvals
  `getPrv` returns the decrypted private key as a string, not an
  object
  Ticket:
diff: @@ -336,8 +336,7 @@ export class PendingApproval {
  throw new Error('txRequestId not found');
  }
  - const { decryptedPrv } = await this.wallet.getPrv({ walletPassphrase });
  -
  + const decryptedPrv = await this.wallet.getPrv({ walletPassphrase });
  const txRequest = await this.tssUtils.recreateTxRequest(txRequestId, decryptedPrv, reqId);
  return {
  txHex: txRequest.unsignedTxs[0].serializedTxHex,
  