eda/EDASQLite: Fixed resetting locking mode to normal before closing database

eda/EDASQLite: Fixed resetting locking mode to normal before closing database
- From http://www.sqlite.org/pragma.html:
Database locks obtained by a connection in EXCLUSIVE mode may be released either by closing the database connection,
or by setting the locking-mode back to NORMAL using this pragma and then accessing the database file (for read or write).
Simply setting the locking-mode to NORMAL is not enough - locks are not released until the next time the database file is accessed.