Revert "Added robot ns to launch file"

This reverts commit 8b4c083.

launch/interaction/speech_recognition.launch

@@ -5,7 +5,6 @@
 	<arg name="machine" default="localhost"/>
     <arg name="dragonfly" default="true" />
     <arg name="kaldi" default="false" />
-    <arg name="robot" default="hero" />
 
     <arg name="model_path" default="$(env HOME)/data/speech_models/model/"/>
 
@@ -14,16 +13,13 @@
 	<!-- Always run a multicast server with a string topic answerer for amigo-hear -->
 	<node name="hmi" pkg="hmi" type="multi_client" machine="$(arg machine)" output="log"/>
 
-    <!-- QR-code -->
-    <group ns="$(arg robot)">
-        <node name="qr_code_decoder" pkg="hmi" type="qr_code_decoder" output="log"/>
-    </group> <!-- ns="$(arg robot)" -->
-
 	<group ns="hmi">
 
-		<!-- amigo-hear -->
+		<!-- QR-code / amigo-hear -->
 		<node name="string_topic_answerer" pkg="hmi" type="string_topic_answerer" output="log"/>
 
+		<node name="qr_code_decoder" pkg="hmi" type="qr_code_decoder" output="log"/>
+
 		<!-- If we are on the real robot, launch the server, otherwise a dummy -->
 		<group if="$(optenv ROBOT_REAL false)">
 			<!-- bridge to windows -->