bundles/backup-client: fix newlines

bundles/backup-client/files/generate-backup

@@ -3,6 +3,8 @@
 statusfile=/var/tmp/backup.monitoring
 ssh_login="${username}@${server}"
 
+NL=$'\n'
+
 if ! [[ -f /etc/backup.priv ]]
 then
     echo "abort_no_key" > "$statusfile"
@@ -29,7 +31,9 @@ do_backup() {
     exitcode=$?
     if [[ $exitcode != 0 ]] && [[ $exitcode != 24 ]]
     then
-        rsync_errors+="\n$1 $exitcode"
+<%text>
+        rsync_errors+="${NL}${1} ${exitcode}"
+</%text>
     fi
 }