fix: fix go staking final options to include signature

Fix go staking final options to include signature

CE-6741

TICKET: CE-6741

Author: silalvado

modules/bitgo/test/v2/unit/staking/goStakingWalletCommon.ts

@@ -104,6 +104,8 @@ describe('Go Staking Wallet Common', function () {
           frontTransferSendRequest: {
             halfSigned: {
               payload: preview.payload,
+              signature:
+                '1f4f7e789ef485363b33dca7273717a4a4413330f2badbcaf302758bc404ff8e930943db81aa2c77007738afa23166934c2a3136bae281bea037095be7183c0602',
             },
           },
           type: 'STAKE',

modules/sdk-core/src/bitgo/staking/goStakingWallet.ts

@@ -52,9 +52,7 @@ export class GoStakingWallet implements IGoStakingWallet {
       amount: options.amount,
       clientId: options.clientId,
       frontTransferSendRequest: {
-        halfSigned: {
-          payload: halfSignedTransaction.halfSigned.payload,
-        },
+        halfSigned: halfSignedTransaction.halfSigned,
       },
     };
     return (await this.finalizeStake(finalOptions)) as GoStakingRequest;