Changing shortcut to toggle preference floater

doc/contributions.txt

@@ -1365,6 +1365,7 @@ YongYong Francois
 Zak Westminster
 Zai Lynch
 	VWR-19505
+    STORM-1902
 Zana Kohime
 Zaren Alexander
 Zarkonnen Decosta

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

@@ -180,7 +180,7 @@
          name="Preferences"
          shortcut="control|P">
             <menu_item_call.on_click
-             function="Floater.Show"
+             function="Floater.Toggle"
              parameter="preferences" />
         </menu_item_call>
          <menu_item_call