Refresh tab TOKENS when changing accounts

[djcyr]

Using Metamask 4.8.0. I have created several accounts, and have custom tokens in both.
When I switch accounts, the TOKENS screen tab still shows the previous account's balance, and does not show the selected accounts current info. Seems the TOKENS tab needs a refresh. BTW, the SENT tab seems to be refreshed properly with transaction history when the account is changed.

A clear and concise description of what the bug is.

To Reproduce

1. create two accounts
2. create and fund custom tokens
3. move some tokens to account 2
4. Select the token tab
5. Switch back and forth (man surrounded by circle arrows) to/from account 1 and 2.
   Only shows one account and is not being refreshed properly

Expected behavior
I expect to select account 1, and see the proper values displayed under TOKENS tab. Then when I select account 2, to see the proper values for account 2 displayed under the TOKENS tab, and not account 1's values.

Screenshots
If applicable, add screenshots to help explain your problem.

Browser details (please complete the following information):

mac high sierra
Brave, MM 4.8.0

• Old UI or New / Beta UI?
  The BETA ui does't have the problem, cause it has no tabs.. :(

[tmashuang]

Fixed with #4884, in version >=v4.9.1.