Fix WOT not starting due to DatabaseMaximumSizeReachedException:
- This fixes issue https://bugs.freenetproject.org/view.php?id=6135
- It will not fix existing broken databases, it just prevents the issue from happening before it has actually happened
- We don't have to fix it for existing broken databases because it is unlikely to happen if the database is defragmented frequently. This is the case for average users: The database is defragmented at every restart of Freenet. Average people don't have very high uptime.