fix grammare error (autowarefoundation#887)

Signed-off-by: Yuxuan Liu <uken.ryu.2@tier4.jp>
Co-authored-by: Yuxuan Liu <uken.ryu.2@tier4.jp>

Author: 2 people

autoware_launch/launch/components/tier4_perception_component.launch.xml

@@ -16,7 +16,7 @@
   <arg name="lidar_detection_model" default="pointpainting" description="options: `centerpoint`, `apollo`, `pointpainting`, `clustering`"/>
   <arg name="traffic_light_recognition/fusion_only" default="true" description="Whether to start only some of the signal recognition related nodes"/>
 
-  <group if="$(eval sensor_model == 'aip_xx1_gen2')">
+  <group if="$(eval &quot;'$(var sensor_model)' == 'aip_xx1_gen2'&quot;)">
     <!-- In the Gen2 sensor configuration, the traffic_light_recognition node is launched not through the conventional autoware.universe/launch/tier4_perception_launch but with its own custom launch file.
     This is because autoware.universe's launch files do not support an arbitrary number of cameras. If autoware.universe's launch files were to support it, it is recommended to use them instead. -->
     <include file="$(find-pkg-share autoware_launch)/launch/components/traffic_light_recognition/traffic_light.launch.xml"/>