Fixed error

automated install/basic-install.sh

@@ -810,7 +810,7 @@ installPiholeWeb() {
   # Add lighttpd user (OS dependent) to sudoers file
   echo "${LIGHTTPD_USER} ALL=NOPASSWD: /usr/local/bin/pihole" >> /etc/sudoers.d/pihole
 
-  if [[ LIGHTTPD_USER == "lighttpd" ]]; then
+  if [[ "$LIGHTTPD_USER" == "lighttpd" ]]; then
     # Allow executing pihole via sudo with Fedora
     # Usually /usr/local/bin is not permitted as directory for sudoable programms
     echo "Defaults secure_path = /sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin" >> /etc/sudoers.d/pihole