Changes PWM channel to avoid backlight/motor conflict

[billyischilly]

Currently the backlight and vibration motor are on PWM channels 0 and 1 respectively which both share a timer. This causes backlight to dim when motor is used as it seems to change the frequency/duty cycle so that the backlight can't show full brightness. I have changed the motor channel number which avoids interference with either the backlight or the buzzer PWM timers.

[igors48]

Thanks for this @billyischilly