Fix init script without HOTRELOAD

supervisor/tfw_init.sh

@@ -4,7 +4,7 @@ set -euo pipefail
 echo "export HISTFILE=\"${TFW_HISTFILE}\"" >> /tmp/bashrc &&
   cat /tmp/bashrc >> "/home/${AVATAO_USER}/.bashrc"
 
-if [[ -z "${HOTRELOAD}" ]]; then
+if [[ -z "${HOTRELOAD-}" ]]; then
   for dir in "${TFW_LIB_DIR}/tfw" "/etc/nginx" "/etc/supervisor"; do
     chown -R root:root "${dir}" && chmod -R 700 "${dir}";
   done