fix the disgnated files location in pr2_mannequin_mode

[aginika]

When I tried to launch like below,

roslaunch pr2_teleop_general pr2_teleop_general_joystick.launch

I got the below error, so I fixed each line.

error loading <rosparam> tag: 
file does not exist [/home/applications/ros/hydro/src/pr2_apps/pr2_mannequin_mode/pr2_arm_controllers_loose.yaml]
XML is <rosparam command="load" file="$(find pr2_mannequin_mode)/pr2_arm_controllers_loose.yaml"/>

• head_position_controller_loose.yaml -> config/head_position_controller_loose.yaml
• pr2_arm_controllers_loose.yaml -> config/pr2_arm_controllers_loose.yaml
• trajectory_lock.launch -> launch/trajectory_lock.launch

[TheDash]

Merged. Looks good.