meta information update is not handled correctly for numeric log items

We seem to handle "meta" information field correctly for items with value type "Log". However, after ZBX-7821, we can also have meta information updates for log[], logrt[] and eventlog[] items with numeric types, but server code was not updated to handle that in ZBX-7821.

Specification: https://www.zabbix.org/wiki/Docs/specs/ZBX-10102