[pepper_control] delete wheel controllers from pepper_control_trajectory_all.launch

[kochigami]

I'd like to use

/pepper_dcm/Head_controller                                                           
/pepper_dcm/Pelvis_controller 

(I'd like to move Pepper's all parts in gazebo environment.)

However,

 /pepper_dcm/WheelFL_controller                                                        
 /pepper_dcm/WheelFR_controller                                                        
 /pepper_dcm/WheelB_controller 

don't seem to be required in ros-naoqi/pepper_robot#31.
(Pepper seems to be likely to bend down because of some force of wheels.)

That's why In this pull-request, I deleted wheel controllers.
Instead, I can modify pepper_control_trajectory.launch (adding /pepper_dcm/Head_controller and /pepper_dcm/Pelvis_controller)
If there is any problem, please let me know.

[nlyubova]

I do not mind to remove wheels. Just I would need some time to test it with our MoveIt grasping pipeline