tests: Use the VK_LAYER_LUNARG_swapchain layer.

This is a prerequisite for testing the VK_LAYER_LUNARG_swapchain layer.
diff --git a/tests/layer_validation_tests.cpp b/tests/layer_validation_tests.cpp
index 07ca4c0..f77e7e8 100644
--- a/tests/layer_validation_tests.cpp
+++ b/tests/layer_validation_tests.cpp
@@ -285,6 +285,7 @@
         instance_layer_names.push_back("VK_LAYER_LUNARG_core_validation");
         instance_layer_names.push_back("VK_LAYER_LUNARG_device_limits");
         instance_layer_names.push_back("VK_LAYER_LUNARG_image");
+        instance_layer_names.push_back("VK_LAYER_LUNARG_swapchain");
         instance_layer_names.push_back("VK_LAYER_GOOGLE_unique_objects");
 
         device_layer_names.push_back("VK_LAYER_GOOGLE_threading");
@@ -293,6 +294,7 @@
         device_layer_names.push_back("VK_LAYER_LUNARG_core_validation");
         device_layer_names.push_back("VK_LAYER_LUNARG_device_limits");
         device_layer_names.push_back("VK_LAYER_LUNARG_image");
+        device_layer_names.push_back("VK_LAYER_LUNARG_swapchain");
         device_layer_names.push_back("VK_LAYER_GOOGLE_unique_objects");
 
         this->app_info.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;