Groupchat destroyed but still there after reconnecting

[Dihcar-76]

Description of the bug
When destroy a MUC. It is still available when new connection again.

To Reproduce
Steps to reproduce the behavior:

1. Go to MUC named salon1
2. Click on menu destroy, MUC is destroyed
3. See MUC still reappears after reconnecting

Expected behavior
MUC is destroyed and doesn't reappear after reconnecting.

Environment (please complete the following information):

• Desktop
• firefox
• Converse.js version 12.0.0

thank you for you help on this issue.

[Dihcar-76]

it seems that the groupchat is marked as bookmark and the when reconnecting it is taken from the cache maybe and is displayed again.