fix(bridge): Fix failing dynamic gas estimates (#2609)

Author: ermyas

packages/internal/bridge/sdk/src/constants/bridges.ts

@@ -52,7 +52,7 @@ export const SLOT_PREFIX_CONTRACT_CALL_APPROVED = '0x07b0d4304f82012bd3b70b1d531
 /**
  * @constant {string} SLOT_POS_CONTRACT_CALL_APPROVED - The position of the storage slot to store contract call approved mapping.
  */
-export const SLOT_POS_CONTRACT_CALL_APPROVED = 4;
+export const SLOT_POS_CONTRACT_CALL_APPROVED = '0x0000000000000000000000000000000000000000000000000000000000000004';
 
 /**
  * @typedef {Object} childWIMXs - Child Wrapped IMX address for the testnet & mainnet.

packages/internal/bridge/sdk/src/tokenBridge.ts

@@ -4,7 +4,6 @@ import axios, { AxiosResponse } from 'axios';
 import {
   concat,
   Contract, getAddress, keccak256, Provider, toBeHex, toQuantity, TransactionRequest,
-  zeroPadValue,
   AbiCoder,
   ZeroAddress,
 } from 'ethers';
@@ -885,7 +884,7 @@ export class TokenBridge {
     const commandHash = keccak256(command);
     const gatewayCallApprovedSlot = keccak256(concat([
       commandHash,
-      toBeHex(zeroPadValue(toBeHex(SLOT_POS_CONTRACT_CALL_APPROVED), 32)),
+      SLOT_POS_CONTRACT_CALL_APPROVED,
     ]));
 
     // Encode execute data