fix: Remove invalid serviceName from s3-deployments template.

Remove `deployments.spec.serviceName` from the s3 deployment template.

`serviceName` isn't a valid field and causes issues when deploying the
chart.

This is the full output for `kubectl explain deployments.spec`
```
KIND:     Deployment
VERSION:  apps/v1

RESOURCE: spec <Object>

DESCRIPTION:
     Specification of the desired behavior of the Deployment.

     DeploymentSpec is the specification of the desired behavior of the
     Deployment.

FIELDS:
   minReadySeconds      <integer>
     Minimum number of seconds for which a newly created pod should be ready
     without any of its container crashing, for it to be considered available.
     Defaults to 0 (pod will be considered available as soon as it is ready)

   paused       <boolean>
     Indicates that the deployment is paused.

   progressDeadlineSeconds      <integer>
     The maximum time in seconds for a deployment to make progress before it is
     considered to be failed. The deployment controller will continue to process
     failed deployments and a condition with a ProgressDeadlineExceeded reason
     will be surfaced in the deployment status. Note that progress will not be
     estimated during the time a deployment is paused. Defaults to 600s.

   replicas     <integer>
     Number of desired pods. This is a pointer to distinguish between explicit
     zero and not specified. Defaults to 1.

   revisionHistoryLimit <integer>
     The number of old ReplicaSets to retain to allow rollback. This is a
     pointer to distinguish between explicit zero and not specified. Defaults to
     10.

   selector     <Object> -required-
     Label selector for pods. Existing ReplicaSets whose pods are selected by
     this will be the ones affected by this deployment. It must match the pod
     template's labels.

   strategy     <Object>
     The deployment strategy to use to replace existing pods with new ones.

   template     <Object> -required-
     Template describes the pods that will be created.
```

k8s/helm_charts2/templates/s3-deployment.yaml

@@ -10,7 +10,6 @@ metadata:
     heritage: {{ .Release.Service }}
     release: {{ .Release.Name }}
 spec:
-  serviceName: {{ template "seaweedfs.name" . }}-s3
   replicas: {{ .Values.s3.replicas }}
   selector:
     matchLabels: