loader: Fix bug in searching for missing extension

Fix small bug in instance creation when extension
(VK_KHR_surface) does not exist. Layer names were
traversed incorrectly.

Change-Id: Icbf435550b6e03ef16003c027d30da3ce5388e93
diff --git a/loader/loader.c b/loader/loader.c
index 8509453..f2db792 100644
--- a/loader/loader.c
+++ b/loader/loader.c
@@ -5821,7 +5821,7 @@
                 break;
             }
 
-            layer_prop = loaderFindLayerProperty(pCreateInfo->ppEnabledLayerNames[j], instance_layers);
+            layer_prop = loaderFindLayerProperty(expanded_layers.list[j].info.layerName, instance_layers);
             if (NULL == layer_prop) {
                 // Should NOT get here, loaderValidateLayers should have already filtered this case out.
                 continue;