If an access token is revoked, Aggregator doesn't update "authorized" status

[mstenta]

(Showed this to @paul121 on screenshare... can add more details later...)

[mstenta]

Quick notes and steps to reproduce:

It seems that when an access token is revoked on the farmOS server, the Aggregator doesn't properly detect that it is no longer authorized, so the status in the Aggregator > Manage Farms UI still shows green "Authorized". Sending API requests to the farmOS instance fail with 401 Client Error: Unauthorized for url: [endpoint].

Clicking the refresh button in the Aggregator UI does not fix this, nor does it give any indication that anything is wrong.

This may also be the cause of #115... which was encountered in the same testing.

To reproduce, revoke the access token in a farmOS instance. An easy way to do this is to change the authorized user's roles.