openshift-apps/flatpak-indexer: Remove a reference to a non-existent secret volume

The deployment config for flatpak-indexer referenced a secret volume that
in the Red Hat internal deployment of flatpak-indexer holds a client certificate,
but is not needed for Fedora.

Signed-off-by: Owen W. Taylor <otaylor@fishsoup.net>

roles/openshift-apps/flatpak-indexer/templates/deploymentconfig.yml

@@ -50,8 +50,6 @@ spec:
           readOnly: true
         - mountPath: /var/www/flatpaks
           name: index-output-volume
-        - mountPath: /etc/tls/flatpak-indexer
-          name: flatpak-indexer-crt-volume
       dnsPolicy: ClusterFirst
       restartPolicy: Always
       volumes: