Use new window_duplicate icon in tdelibs.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit a25ecca6b5)

src/thememoodin.h

@@ -57,7 +57,7 @@ public:
     l << "filetypes"; // 1 filetypes
     l << "application-x-executable"; // 2 application-x-executable
     l << "key_bindings"; // 3 key_bindings
-    l << "window_list"; // 4 window_list
+    l << "window_duplicate"; // 4 window_duplicate
     l << "desktop"; // 5 desktop
     l << "style"; // 6 style
     l << "preferences-system"; // 7 preferences-system