Remove grid in rescue people

Author: javizqh

Worlds/rescue_people_harmonic.world

@@ -30,11 +30,9 @@
       <direction>-0.5 0.1 -0.9</direction>
     </light>
 
-    <gui>
-      <camera name='user_camera'>
-        <pose>4.5 4.5 1.5 0 0 -0.785</pose>
-      </camera>
-    </gui>
+    <scene>
+      <grid>false</grid>
+    </scene>
 
     <!-- People -->
     <include>