master_big.world: change gui initial camera position

worlds/master_big.world

@@ -29,6 +29,13 @@
         </visual>
       </link>
     </model>
+    <gui fullscreen='0'>
+      <camera name='user_camera'>
+        <pose>25 -50 60 0 0.86 1.57</pose>
+        <view_controller>orbit</view_controller>
+        <projection_type>perspective</projection_type>
+      </camera>
+    </gui>
 
   </world>
 </sdf>