jicofo: fix template error in jvb xmpp server (#1500)

jicofo/rootfs/defaults/jicofo.conf

@@ -5,7 +5,7 @@
 {{ $ENABLE_OCTO := .Env.ENABLE_OCTO | default "0" | toBool }}
 {{ $ENABLE_AUTO_LOGIN := .Env.ENABLE_AUTO_LOGIN | default "1" | toBool }}
 {{ $ENABLE_REST := .Env.JICOFO_ENABLE_REST | default "0" | toBool }}
-{{ $ENABLE_JVB_XMPP_SERVER := Env.ENABLE_JVB_XMPP_SERVER | default "0" | toBool }}
+{{ $ENABLE_JVB_XMPP_SERVER := .Env.ENABLE_JVB_XMPP_SERVER | default "0" | toBool }}
 {{ $HEALTH_CHECKS_USE_PRESENCE := .Env.JICOFO_HEALTH_CHECKS_USE_PRESENCE | default "0" | toBool }}
 {{ $JIBRI_BREWERY_MUC := .Env.JIBRI_BREWERY_MUC | default "jibribrewery" -}}
 {{ $JIGASI_BREWERY_MUC := .Env.JIGASI_BREWERY_MUC | default "jigasibrewery" -}}