[stable/grafana] fix dashboard loading regression #12400 (#12512)

Fixing multiline indicator usage that was broken by PR #11997
that prevented custom prebuilt dashboards to be loaded from file on helm install.

Signed-off-by: Jannis Oeltjen <oss@jcoeltjen.de>

stable/grafana/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: grafana
-version: 2.3.4
+version: 2.3.5
 appVersion: 6.0.2
 kubeVersion: "^1.8.0-0"
 description: The leading tool for querying and visualizing time series and metrics.

stable/grafana/templates/dashboards-json-configmap.yaml

@@ -15,9 +15,10 @@ metadata:
 data:
 {{- range $key, $value := $dashboards }}
 {{- if (or (hasKey $value "json") (hasKey $value "file")) }}
-{{ print $key | indent 2 }}.json: |-
+{{ print $key | indent 2 }}.json:
 {{- if hasKey $value "json" }}
-{{ $value.json | indent 4 }}
+    |-
+{{ $value.json | indent 6 }}
 {{- end }}
 {{- if hasKey $value "file" }}
 {{ toYaml ( $files.Get $value.file ) | indent 4}}