[solved] Change function of backspace key

[TheDax]

It's hard-coded to always go back in menus, but it shouldn't be showing the pause screen if you unbind it from pause(actually, in 0.9.1 official, it'll be forced, but in the newer dev builds it should be completely flexible)..

If you know how to compile, yes, you can change the hard-coded key.

In this function, simply remove NKCODE_ESCAPE from the list of hard coded Cancel keys. I hard coded escape because we have to have a bare minimum of accept and cancel keys, otherwise you wouldn't be able to navigate the UI. It's supposed to NOT act as a menu opener when you un-bind it from pause and re-bind it to something else, though..