fix: helm chart service label indentation issues

[liymike]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This pull request fixes an indentation issue in the labels section under

device-plugin/monitorservice.yaml
scheduler/service.yaml

in the Helm chart.

Which issue(s) this PR fixes:
Fixes #

Currently, the custom service labels are indented with 4 extra spaces, which is inconsistent with the other labels like below.

apiVersion: v1
kind: Service
metadata:
  name: hami-device-plugin-monitor
  labels:
    app.kubernetes.io/component: hami-device-plugin
    helm.sh/chart: hami-2.4.1
    app.kubernetes.io/name: hami
    app.kubernetes.io/instance: hami
    app.kubernetes.io/version: "2.4.1"
    app.kubernetes.io/managed-by: Helm
        monitored-by: vm

This PR corrects the indentation to align with the rest of the labels.

Special notes for your reviewer:

Does this PR introduce a user-facing change?: