fix: add missing $ to JIGASI_XMPP_USER

jigasi/rootfs/defaults/sip-communicator.properties

@@ -1,5 +1,5 @@
 {{ $JIGASI_BREWERY_MUC := .Env.JIGASI_BREWERY_MUC | default "jigasibrewery" -}}
-{{ JIGASI_XMPP_USER := .Env.JIGASI_XMPP_USER | default "jigasi" -}}
+{{ $JIGASI_XMPP_USER := .Env.JIGASI_XMPP_USER | default "jigasi" -}}
 {{ $XMPP_AUTH_DOMAIN := .Env.XMPP_AUTH_DOMAIN | default "auth.meet.jitsi" -}}
 {{ $XMPP_MUC_DOMAIN := .Env.XMPP_MUC_DOMAIN | default "muc.meet.jitsi" -}}
 {{ $XMPP_GUEST_DOMAIN := .Env.XMPP_GUEST_DOMAIN | default "guest.meet.jitsi" -}}