Ingame key result isn't disabled when trying to rebind keys

```
When you try to rebind keys while ingame, if the key you press is supposed to 
open a new menu, it WILL open a new menu, effectively preventing you to rebind 
anything with that key. Example with the navpoint menu, default N.
```

Original issue reported on code.google.com by `matththe...@gmail.com` on 23 Jun 2012 at 9:12
