user: Fix disabled menu item behavior

[Dan Kegel]

Tommy Kho wrote:
>This patch changes the behavior of selecting greyed out menu items via
>accelerator key. Wine currently keeps the menu open; Windows closes the menu.
> ...
>     else
>+    {
> 	pmt->hCurrentMenu = MENU_ShowSubPopup(pmt->hOwnerWnd, hMenu, TRUE, wFlags);
>+        return -1;
>+    }
>
>-    return -1;
>+    return -2;
> }

Err, isn't the return -2 at the bottom dead code now?
That seems wrong...
- Dan

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