Correct double tilt in motor_lugs()
From issue #339 (closed), the actuator tilt is applied twice to the cut-out in motor_lugs()
.
This merge request removes the extra tilt and produces lugs that remain the same shape when rotated.
motor_lugs(h=30, tilt=15, angle=0);
motor_lugs(h=30, tilt=0, angle=0);
motor_lugs(h=30, tilt=-15, angle=0);
Closes #339 (closed)