Fix HostsDeleteByIds request due to documentation (#11)

* Update host requests due to documentation

Fix request body to delete hosts by IDs. https://www.zabbix.com/documentation/6.0/en/manual/api/reference/host/delete#:~:text=Examples-,Deleting%20multiple%20hosts,-Delete%20two%20hosts

Here we don't need hostids key. So it's just converted to list of ids.

* refactor hostids

Co-authored-by: Artem Kravchenko <artem.kravchenko@exness.com>

host.go

@@ -145,12 +145,7 @@ func (api *API) HostsDelete(hosts Hosts) (err error) {
 // HostsDeleteByIds Wrapper for host.delete
 // https://www.zabbix.com/documentation/3.2/manual/api/reference/host/delete
 func (api *API) HostsDeleteByIds(ids []string) (err error) {
-	hostIds := make([]map[string]string, len(ids))
-	for i, id := range ids {
-		hostIds[i] = map[string]string{"hostid": id}
-	}
-
-	response, err := api.CallWithError("host.delete", hostIds)
+	response, err := api.CallWithError("host.delete", ids)
 	if err != nil {
 		// Zabbix 2.4 uses new syntax only
 		if e, ok := err.(*Error); ok && e.Code == -32500 {