Compton: Re-enable Polybar shadows

Because those work well this time around

.config/compton.conf

@@ -99,7 +99,7 @@ shadow-exclude = [
     "class_g ?= 'Cairo-dock'",
     "class_g ?= 'Xfce4-notifyd'",
     "class_g ?= 'Xfce4-power-manager'",
-    "window_type = 'dock'",
+    #"window_type = 'dock'",
     "_GTK_FRAME_EXTENTS@:c"
 ];
 # Avoid drawing shadow on all shaped windows (see also: --detect-rounded-corners)