Update of example file

Removed sid in <terrain> in example file

Author: stephane-pv

Examples/05 - VerySimpleFixedPVC2_with_electrical_layout_v3.pvc

@@ -355,7 +355,7 @@
 			<extra>
 				<technique profile="PVCollada-2.0">
 					<!-- terrain tag -->
-					<pv:terrain sid="Terrain">
+					<pv:terrain>
 						<pv:vertex_count>4</pv:vertex_count>
 						<pv:triangle_count>2</pv:triangle_count>
 						<pv:bounding_box_min>-10.0 -20.0 -30.0</pv:bounding_box_min>