AccountTrackerController: Remove ref to providerConfig (#4306)

The `providerConfig` state property is being removed from
NetworkController. Currently this property is used in
AccountTrackerController to access the type of the `chainId` property,
but we know that this type is `Hex`, so we can simply use it directly.
This commit makes that change so that we can fully drop
`providerConfig`.

packages/assets-controllers/src/AccountTrackerController.ts

@@ -5,10 +5,10 @@ import type { Provider } from '@metamask/eth-query';
 import type {
   NetworkClientId,
   NetworkController,
-  NetworkState,
 } from '@metamask/network-controller';
 import { StaticIntervalPollingControllerV1 } from '@metamask/polling-controller';
 import type { PreferencesState } from '@metamask/preferences-controller';
+import type { Hex } from '@metamask/utils';
 import { assert } from '@metamask/utils';
 import { Mutex } from 'async-mutex';
 import { cloneDeep } from 'lodash';
@@ -120,7 +120,7 @@ export class AccountTrackerController extends StaticIntervalPollingControllerV1<
 
   private readonly getMultiAccountBalancesEnabled: () => PreferencesState['isMultiAccountBalancesEnabled'];
 
-  private readonly getCurrentChainId: () => NetworkState['providerConfig']['chainId'];
+  private readonly getCurrentChainId: () => Hex;
 
   private readonly getNetworkClientById: NetworkController['getNetworkClientById'];
 
@@ -152,7 +152,7 @@ export class AccountTrackerController extends StaticIntervalPollingControllerV1<
       getIdentities: () => PreferencesState['identities'];
       getSelectedAddress: () => PreferencesState['selectedAddress'];
       getMultiAccountBalancesEnabled: () => PreferencesState['isMultiAccountBalancesEnabled'];
-      getCurrentChainId: () => NetworkState['providerConfig']['chainId'];
+      getCurrentChainId: () => Hex;
       getNetworkClientById: NetworkController['getNetworkClientById'];
     },
     config?: Partial<AccountTrackerConfig>,