Midflight controls adjustment GUI behavior bits

A few things that would make controls adjusting less jerky is that the OK and CANCEL button should go back to the escape menu and not resume the game, and/or an APPLY button would be nice to save the changes occasionally during some cases.

When I test, I continously change and go back and forth, but sometimes I just want to SAVE, but the function of the OK button isn't optimal for such a purpose.

Saving the controls regularly is a good idea when doing other things like viewing files and images of controls information, manual, saved profiles outside of DCS, and even going AFK during that.

With so many controls I think any such things around the management of them are justified, should be made as smooth and clear as possible, losing the changes can mean a lot of lost time, it happened once and I lost about more than an hour for sure I think, sure on the second time I had it more memorized but still.