[banks] Run bank script on latest woob

Probably a bit more to do. Not sure which migrations we can handle ourselves, the one for the changing custom value is intractable, so we might as well clear the value in the database…

• script: Mark ticketscesu as deprecated
• migration: Remove custom field for banque populaire accounts, and mark them as unsynchronized?
• add icon for new CCF bank
• (bonus) better display name for CCF bank