NRI-128: reduced joint limit for back x in sdf - if we go all the way to

the limit cables get pinched and the robot does not have enough torque
to get back up. By reducing the limits we avoid both.

Author: Operator Computer

Atlas/resources/models/GFE/atlas_unplugged_v5_dual_robotiq.sdf

@@ -746,8 +746,8 @@
       <axis>
         <xyz>1 0 0</xyz>
         <limit>
-          <lower>-0.523599</lower>
-          <upper>0.523599</upper>
+          <lower>-0.40</lower>
+          <upper>0.40</upper>
           <effort>300</effort>
           <velocity>12</velocity>
         </limit>