feat: update single_node configuration in Snuba helper template

Author: TartanLeGrand

charts/sentry/templates/snuba/_helper-snuba.tpl

@@ -77,7 +77,7 @@ settings.py: |
         clickhouse configured can be configured any way you choose
       */}}
       {{- if and .Values.externalClickhouse.singleNode (not .Values.clickhouse.enabled) }}
-      "single_node": False,
+      "single_node": True,
       {{- else }}
       "single_node": False,
       {{- end }}