SL-15736 Show checkmark in the menu while Improve Graphics Speed floater is open

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

@@ -853,13 +853,16 @@
                parameter="UseDebugMenus" />
           </menu_item_check>
         </menu>
-        <menu_item_call
+        <menu_item_check
           label="Improve graphics speed..."
           name="Performance">
-          <menu_item_call.on_click
+          <menu_item_check.on_click
            function="Floater.Toggle"
            parameter="performance" />
-        </menu_item_call>
+          <menu_item_check.on_check
+           function="Floater.Visible"
+           parameter="performance" />
+        </menu_item_check>
         <menu_item_separator/>
     <!--    <menu_item_check
          label="Show Navigation Bar"