Replace otherwise useless link

src/freedombone-utils-webadmin

@@ -765,6 +765,7 @@ function web_admin_create_installed_apps {
                         sed -i '/ONIONURL/d' "$filename"
                         # Show DNS IP address for pi-hole
                         if [[ "$app_name" == 'pihole' ]]; then
+                            sed -i "s|\"APPURL\"|\"\"|" "$filename"
                             sed -i '/.appurl/,/font-size:/s/font-size:.*/font-size: 150%;/' "$filename"
                             sed -i "s|APPURL|$(get_ipv4_address)|g" "$filename"
                         fi