[azure-resourcegraph-exporter]` fix servicemonitor yaml formatting error#63

[tobias0106]

What this PR does / why we need it

• fixes #
  error converting YAML to JSON: yaml: line 6: mapping values are not allowed in this context #63

Special notes for your reviewer

This is just a quick fix. Do you prefer the same style as in azure-metrics-exporter:

  labels:
    {{ include "azure-metrics-exporter.labels" . | nindent 4 }}
    {{- with .Values.prometheus.monitor.additionalLabels }}
    {{- toYaml . | nindent 4 }}
    {{- end }}

If, please let me know and i will create a new PR.

Checklist

• Chart Version bumped
• Title of the PR starts with chart name (e.g. [azure-metrics-exporter])