Fix accountTracker store references

app/scripts/controllers/transactions.js

@@ -52,7 +52,7 @@ module.exports = class TransactionController extends EventEmitter {
       provider: this.provider,
       nonceTracker: this.nonceTracker,
       getBalance: (address) => {
-        const account = this.accountTracker.getState().accounts[address]
+        const account = this.accountTracker.store.getState().accounts[address]
         if (!account) return
         return account.balance
       },

app/scripts/keyring-controller.js

@@ -568,7 +568,7 @@ class KeyringController extends EventEmitter {
   clearKeyrings () {
     let accounts
     try {
-      accounts = Object.keys(this.accountTracker.getState())
+      accounts = Object.keys(this.accountTracker.store.getState())
     } catch (e) {
       accounts = []
     }