Actually use emptydir mount when persistence is disabled

In #2124, an emptydir was mounted when `persistence.enabled: false` is set. However, this is not
enough to make registry work: it crashloops as in issue #1998. This is fixed by setting the env variable
specifying storage config even if persistence is disabled.

Signed-off-by: Adam Michalik <amichalik@anduril.com>

packages/zarf-registry/chart/templates/deployment.yaml

@@ -71,10 +71,8 @@ spec:
               value: "Registry Realm"
             - name: REGISTRY_AUTH_HTPASSWD_PATH
               value: "/etc/docker/registry/htpasswd"
-{{- if .Values.persistence.enabled }}
             - name: REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY
               value: "/var/lib/registry"
-{{- end }}
 {{- if .Values.persistence.deleteEnabled }}
             - name: REGISTRY_STORAGE_DELETE_ENABLED
               value: "true"