[Bug] Passive devices do not stop when program ends

[laurensvalk]

Describe the bug
Passive devices such as train motors or lights aren't automatically turned off when the program ends.

This is a known issue that was "intentionally" introduced as a workaround to keep the power on for the Ultrasonic/Color sensor while fixing the hotplugging issue.

But it needs to get fixed for the upcoming 3.0 release. We don't want a train to keep running when you stop it.

To reproduce

from pybricks.pupdevices import DCMotor
from pybricks.parameters import Port
from pybricks.tools import wait

# Start the motor
motor = DCMotor(Port.C)
motor.dc(50)

# Wait a second
wait(1000)

# The motor should stop automatically here, but it does not

[laurensvalk]

@Nelvarion - today's release fixes this!