fix simple zero torque controller

...ts/units/RobotUnit/NJointControllers/NJointController.ipp

source/RobotAPI/libraries/KITGripperEtherCAT/CMakeLists.txt

...erBasisBoard/JointController/JointPWMTorqueController.cpp

...BasisBoard/JointController/JointPWMVelocityController.cpp

...therCAT/KITGripperBasisBoard/KITGripperBasisBoardData.cpp

...rEtherCAT/KITGripperBasisBoard/KITGripperBasisBoardData.h

...herCAT/KITGripperBasisBoard/KITGripperBasisBoardSlave.cpp

...erEtherCAT/KITGripperBasisBoard/Misc/TorqueEstimation.cpp

...pperEtherCAT/KITGripperBasisBoard/Misc/TorqueEstimation.h

...erCAT/KITGripperBasisBoard/Misc/TorqueEstimationWeights.h