[__jitsi_meet_domain] Simplify logic for secured domains

type/__jitsi_meet_domain/files/config.js.sh

@@ -13,14 +13,8 @@ var config = {
         domain: '${JITSI_HOST}',
 
         // When using authentication, domain for guest users.
-$( if [ -n "${SECURED_DOMAINS}" ]; then cat<<EOF2
-        anonymousdomain: 'guest.${JITSI_HOST}',
-EOF2
-else cat <<EOF2
-        // anonymousdomain: 'guest.example.com',
-EOF2
-fi
-)
+        $( if [ -z "${SECURED_DOMAINS}" ]; then printf "// "
+	fi)anonymousdomain: 'guest.${JITSI_HOST}',
 
         // Domain for authenticated users. Defaults to <domain>.
         // authdomain: '${JITSI_HOST}',