Reconnect to websocket on access_token change

[Minei3oat]

When firegex looses the database on restart (for example due to stop --clear & start), several things fail/get out of sync:

• the password is already inserted in the password field
• the websocket connection is established on loading (and fails due to old JWT) and not reconnected after login
• the old nfregexs are shown

This branch fixes the websocket.