Start auton from start_dist as well

The sim now seems to start the buggy at the correct place, but auton doesn't seem to take it well and causes buggy to steer in very tight circles (buggy appears static on map)

rb_ws/src/buggy/launch/sim_2d_single.launch

@@ -1,6 +1,6 @@
 <launch>
-    <arg name="autonsystem_args" default="--controller stanley --dist 0.0 --traj buggycourse_safe_1.json --self_name SC" />
-    <arg name="starting_dist"    default="0.0" />
+    <arg name="autonsystem_args" default="--controller stanley --dist $(arg start_dist) --traj buggycourse_safe_1.json --self_name SC" />
+    <arg name="start_dist"       default="0.0" />
     <arg name="velocity"         default="15.0" />
     <arg name="buggy_name"       default="SC" />
 
@@ -22,7 +22,7 @@
     </group>
 
     <node name="sim_2d_engine" pkg="buggy" type="engine.py" output="screen"
-        args="$(arg starting_dist) $(arg velocity) $(arg buggy_name)"/>
+        args="$(arg start_dist) $(arg velocity) $(arg buggy_name)"/>
 
     <node name="auton_system" pkg="buggy" type="autonsystem.py" output="screen"
         args="$(arg autonsystem_args)"/>