Remove DB-validation after init, if no reviewDB is used

After allowing not to use the ReviewDB there was still a DB validation
after the Gerrit init, which could keep Gerrit from starting, if the
gerrit.config still contained the `database`-section.

Change-Id: I85ced582fa6fd737bd22f17cbaec16cf52bde7f7
diff --git a/helm-charts/gerrit-master/templates/gerrit-master.stateful-set.yaml b/helm-charts/gerrit-master/templates/gerrit-master.stateful-set.yaml
index 3a2ab0b..1c8be83 100644
--- a/helm-charts/gerrit-master/templates/gerrit-master.stateful-set.yaml
+++ b/helm-charts/gerrit-master/templates/gerrit-master.stateful-set.yaml
@@ -81,7 +81,9 @@
 
           symlink_config_to_site
 
+          {{- if .Values.gerritMaster.reviewdb.enabled }}
           /var/tools/validate_db.py -s /var/gerrit
+          {{- end }}
         volumeMounts:
         - name: gerrit-site
           mountPath: "/var/gerrit"