bug: DbCount is not updated

[nakamasato]

https://github.com/nakamasato/mysql-operator/blob/main/CONTRIBUTING.md

NAME                                      HOST        ADMINUSER   CONNECTED   REASON                                   USERCOUNT   DBCOUNT
mysql.mysql.nakamasato.com/mysql-sample   localhost   root        true        Ping succeded and updated MySQLClients   1           0

NAME                                     PHASE   REASON
mysqldb.mysql.nakamasato.com/sample-db   Ready   Database successfully created

NAME                                        MYSQLUSER   SECRET   PHASE   REASON
mysqluser.mysql.nakamasato.com/nakamasato   true        true     Ready   Both secret and mysql user are successfully created.