fixed panda model

Author: jhavl

roboticstoolbox/models/xacro/franka_description/robots/hand.xacro

@@ -61,6 +61,7 @@
     </link>
     <link name="${ns}_rightfinger">
       <visual>
+        <origin xyz="0 0 0" rpy="0 0 ${pi}"/>
         <geometry>
           <mesh filename="package://franka_description/meshes/visual/finger.dae"/>
         </geometry>