fix path for buttons

[TheDuckGoesQuark]

Right now this error crops up:

robot@ev3dev:~$ gocode/bin/GoEV3  

What would you like to test? Press Escape to exit.
[X] Touch sensor and sound
[ ] Ultrasonic sensor
[ ] Infrared sensor
[ ] Color sensor
[ ] Speech and brick buttons
[ ] Motors
[ ] LEDs

2021/08/01 12:15:32 Cannot find keys file

Caused by the same issue here which was fixed the same way