Fix multiple extraDeploy objects linting (#915)

### Description of the change

When the template is rendered, preceding whitespace is removed, creating
a yaml object like `---apiVersion: ...` which `helm template` can handle
but `helm lint` fails on as discussed in
https://github.com/helm/helm/issues/10149. By not removing this
whitespace, templates render correctly.

### Benefits

`helm lint` will pass

### Possible drawbacks

`helm diff` and similar tools might display whitespace changes, but no semantic changes.

### Checklist

Added no unit tests because there are non for `extraDeploy`.

- [ ] Helm templating unittests are added (required when changing anything in `templates` folder)

Co-authored-by: javex <code@inexplicity.de>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-on: https://gitea.com/gitea/helm-gitea/pulls/915
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Javex <javex@noreply.gitea.com>
Co-committed-by: Javex <javex@noreply.gitea.com>

templates/gitea/extra-list.yaml

@@ -1,8 +1,8 @@
 {{- range .Values.extraDeploy }}
 ---
 {{- if typeIs "string" . }}
-    {{- tpl . $ }}
+    {{ tpl . $ }}
 {{- else }}
-    {{- tpl (. | toYaml) $ }}
+    {{ tpl (. | toYaml) $ }}
 {{- end }}
 {{- end }}