remove non existing timeout parameter

Author: christian-rauch

robotiq_3f_gripper_articulated_gazebo/launch/robotiq_gripper_empty_world.launch

@@ -18,6 +18,6 @@
   </node>
 
   <!-- spawn in gazebo -->
-  <node name="spawn_gazebo_model" pkg="gazebo_ros" type="spawn_model" args="-urdf -param robot_description -model robot -z 0.1 -timeout 120" respawn="false" output="screen" />
+  <node name="spawn_gazebo_model" pkg="gazebo_ros" type="spawn_model" args="-urdf -param robot_description -model robot -z 0.1" respawn="false" output="screen" />
 
 </launch>