Update proxy_set_linux_sh

https://github.com/2dust/v2rayN/issues/6937

v2rayN/ServiceLib/Sample/proxy_set_linux_sh

@@ -84,6 +84,11 @@ detect_desktop_environment() {
         echo "gnome"
         return
     fi
+    
+    if [[ "$XDG_CURRENT_DESKTOP" == *"XFCE"* ]] || [[ "$XDG_SESSION_DESKTOP" == *"XFCE"* ]]; then
+        echo "gnome"
+        return
+    fi
 
     local KDE_ENVIRONMENTS=("KDE" "plasma")
     for ENV in "${KDE_ENVIRONMENTS[@]}"; do