update pwm check to look in /sys/class instead of /sys/devices
update pwm check to look in /sys/class instead of /sys/devices

StrawsonDesign/Robotics_Cape_Installer,Andrewiski/Robotics_Cape_Installer,Andrewiski/Robotics_Cape_Installer,Andrewiski/Robotics_Cape_Installer,StrawsonDesign/Robotics_Cape_Installer,StrawsonDesign/Robotics_Cape_Installer