Add quotes

scripts/prerm.sh

@@ -3,7 +3,7 @@ set -e
 
 # Stop systemd service
 if [ -d /run/systemd/system ]; then
-  if [ "$1" = remove ] || [ "$1" = "0" ]; then
+  if [ "$1" = "remove" ] || [ "$1" = "0" ]; then
     echo "Stopping ntfy.service ..."
     if [ -x /usr/bin/deb-systemd-invoke ]; then
       deb-systemd-invoke stop 'ntfy.service' >/dev/null || true