Revert "Update 'root/usr/libexec/argon/online_wallpaper'"

This reverts commit db6edb6137.

root/usr/libexec/argon/online_wallpaper

@@ -6,21 +6,6 @@
 WEB_PIC_SRC=$(uci -q get argon.@global[0].online_wallpaper || echo 'bing')
 CACHE=/var/run/argon_${WEB_PIC_SRC}.url
 WRLOCK=/var/lock/argon_${WEB_PIC_SRC}.lock
-#Fix Dark and Light mode CSS on dashboard
-local argon_mode=$(uci get argon.@global[0].mode 2>/dev/null)
- local css_path="/www/luci-static/resources/view/dashboard/css/custom.css"
-    
- if [[ "$argon_mode" == "dark" ]]; then
-     echo "Applying dark mode..."
-     rm -f "$css_path"
-     cp -f /etc/dark.css "$css_path"
- elif [[ "$argon_mode" == "light" ]]; then
-     echo "Applying light mode..."
-     rm -f "$css_path"
-     cp -f /etc/light.css "$css_path"
- else
-     echo "The Argon theme mode is set to normal or is undefined. No changes made."
-fi
 
 fetch_pic_url() {
     case $WEB_PIC_SRC in