Fix gripper movement in simulation.

talos_description/gazebo/gazebo.urdf.xacro

talos_description/urdf/arm/arm.urdf.xacro

talos_description/urdf/arm/wrist.urdf.xacro

talos_description/urdf/gripper/gripper.gazebo.xacro

talos_description/urdf/gripper/gripper.transmission.xacro

talos_description/urdf/gripper/gripper_v2.urdf.xacro

talos_description/urdf/head/head.urdf.xacro

talos_description/urdf/leg/leg_v2.urdf.xacro

talos_description/urdf/sensors/xtion_pro_live.gazebo.xacro