Fix autocomplete CSS with the same fix the Mac CSS has for autocomplete. Followup to previous checkin.

themes/classic/global/win/autocomplete.css

@@ -90,6 +90,7 @@ textbox {
 }
 
 .autocomplete-treecol {
+  -moz-appearance: none;
   margin: 0 !important;
   border: none !important;
   padding: 0 !important;