STORM-1599 FIXED Scrolling search history with mouse wheel now doesn't zoom...

STORM-1599 FIXED Scrolling search history with mouse wheel now doesn't zoom the wold view upon reaching the end of list.

indra/newview/skins/default/xui/en/panel_navigation_bar.xml

@@ -146,7 +146,8 @@
           border.highlight_light_color="FocusColor"
           border.highlight_dark_color="FocusColor"
           border.shadow_light_color="FocusColor"
-          border.shadow_dark_color="FocusColor"/>
+          border.shadow_dark_color="FocusColor"
+          mouse_wheel_opaque="true" />
         </search_combo_box>
 	</panel>
     <favorites_bar