Update zabbix-mysql-backupconf.sh

The zabbix database has changed. We use Zabbix 2.2.3 at this time.
So I've updated the tables in section "CONSTANTS"
Merge pull request #2 from dre-/patch-2

Update zabbix-mysql-backupconf.sh for Zabbix 2.2.3, thanks for great work to @dre-