Fix incorrect handler names

[gunnarbeutner]

Description of PR

This PR fixes incorrect handler names which I broke in #298.

Type of change

Bugfix Pull Request

Fixes an issue

TASK [dj-wasabi.zabbix-agent : Installing user-defined userparameters] ***********************************************************************************************************************************************************************
changed: [ztest] => (item={'name': 'zfs'})
ERROR! The requested handler 'restart win zabbix-agent' was not found in either the main handlers list nor in the listening handlers list

[dj-wasabi]

Thanks! 👍