Fix for Slightly Buggy Control Rebinding

[Etymonym]

I had an issue when trying to rebind controls where buttons would still perform their original function even after being rebound, leading to a single button doing two things -- which would frequently be problematic for platforming.

I was able to fix this by specifically:
1. Rebinding the desired controls
2. Clicking Apply
3. Clicking Return ( and *not* using the "B" button or whatever you have bound to "Back" in Menus )

It seems like using the "Back" button to leave the rebinding menu was causing the re-binding to only partially apply -- adding only the new bindings and not removing the old ones.

Hope this helps anyone else who may have been having the same issue!