Regenerate template files so that all of them have template tags

After implementing ZBXNEXT-4731 tags have been added to templates. Now when a template is being exported <tags/> element are added. Current existing templates located in templates/ directory does not have these elements and therefor should be regenerated.

Steps to reproduce:

1. Create new Zabbix instance
2. Export any existing template
3. Do a diff between the just exported template and its equivalent .xml from templates/

Result:
+             <tags/>
Expected:
No difference.