seat_car_teleop: invert steering set to false, not needed in either real car or simulated car

launch/node.launch

@@ -3,7 +3,7 @@
   
   <arg name="node_name" default="twist_to_manual_control"/>
   <arg name="invert_speed"    default="True"/>
-  <arg name="invert_steering" default="True"/>
+  <arg name="invert_steering" default="False"/>
   <arg name="twist_topic"     default="/cmd_vel"/>
   <arg name="steering_topic"  default="/manual_control/steering"/>
   <arg name="speed_topic"     default="/manual_control/speed"/>