[FTC]: Prevent Burnt Motors - Updated RobotC Joystick Driver

[l0jec]

First off, thank you for taking the initiative on this. A simple fix was long overdue. I took a quick look at your code and from a glance it looks like it should work, but I would like to compare against the original once I get home to really review the changes.
Regardless, I think you have the right idea and ask if it isn't too much, could you also post this to the ROBOTC forums for additional feedback/visability? If we can test & review this code change as a community, then I think we should be able to follow-up with FIRST to update the official JoystickDriver.c in the next release of ROBOTC.