Helmchart deploys zabbixProxy with incorrect affinities caused by wrong indentation

Steps to reproduce:

Deploy helmchart with zabbixProxy affinity

```yaml
zabbixProxy:
affinity:
nodeAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- preference:
matchExpressions:
- key: "node-role.kubernetes.io/control-plane"
operator: "Exists"
```

generate in zabbix-proxy deployment:

```yaml
spec:
template:
spec:
affinity: null
nodeAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- preference:
matchExpressions:
- key: node-role.kubernetes.io/control-plane
operator: Exists
```
 

caused by :

https://git.zabbix.com/projects/ZT/repos/kubernetes-helm/browse/templates/zabbix-proxy.yaml#86

expected : indent 8 not 6