Fix broken claiming via kickstart on some systems. (#18789)

packaging/installer/kickstart.sh

@@ -1275,7 +1275,7 @@ write_claim_config() {
   run_as_root touch "${claim_config}.tmp" || return 1
   run_as_root chmod 0640 "${claim_config}.tmp" || return 1
   run_as_root chown ":${NETDATA_CLAIM_GROUP:-netdata}" "${claim_config}.tmp" || return 1
-  run_as_root sh -c "echo -e \"${config}\" > \"${claim_config}.tmp\"" || return 1
+  run_as_root sh -c "printf '${config}\\n' > \"${claim_config}.tmp\"" || return 1
   run_as_root mv -f "${claim_config}.tmp" "${claim_config}" || return 1
 
   if [ -z "${NETDATA_CLAIM_NORELOAD}" ]; then