FIX Motor not turning backwards

Nicolas Hohausrequested to merge
patch-1 into master

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A bug turning DcMotors very slowly in reverse orientation was fixed. It is very important that this merge request gets merged as soon as possible!

Review information

The algorithm preventing the motors to be run with too little power to actually be turning what would only cause a stressing sound, was accidently not using the absolute value of the power what caused negative values to be set to a very slow speed.

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