tests: Fix copy/paste bug in test framework

Unsupported layers were being erased from the wrong vector

Change-Id: I0fbd4226c6c361e4565e41d703eceef9d41ba46d
diff --git a/tests/vkrenderframework.cpp b/tests/vkrenderframework.cpp
index bcfdfe9..c799615 100644
--- a/tests/vkrenderframework.cpp
+++ b/tests/vkrenderframework.cpp
@@ -141,7 +141,7 @@
     for (auto layer = m_instance_layer_names.begin(); layer != m_instance_layer_names.end();) {
         if (!InstanceLayerSupported(*layer)) {
             ADD_FAILURE() << "InitFramework(): Requested layer " << *layer << " was not found. Disabled.";
-            layer = m_instance_extension_names.erase(layer);
+            layer = m_instance_layer_names.erase(layer);
         } else {
             ++layer;
         }