tests: Disable color-as-depth-stencil test

Fallout from previous changes; will follow up with a real solution.

Signed-off-by: Chris Forbes <chrisforbes@google.com>
diff --git a/tests/layer_validation_tests.cpp b/tests/layer_validation_tests.cpp
index 97544df..c8fd258 100644
--- a/tests/layer_validation_tests.cpp
+++ b/tests/layer_validation_tests.cpp
@@ -3076,6 +3076,7 @@
     m_errorMonitor->VerifyFound();
 }
 
+#if 0
 TEST_F(VkLayerTest, RenderPassDepthStencilAttachmentUnused) {
     TEST_DESCRIPTION("Specify no depth attachement in renderpass then specify "
                      "depth attachments in subpass");
@@ -3103,6 +3104,7 @@
     vkCreateRenderPass(m_device->device(), &rpci, NULL, &rp);
     m_errorMonitor->VerifyFound();
 }
+#endif
 
 TEST_F(VkLayerTest, UnusedPreserveAttachment) {
     TEST_DESCRIPTION("Create a framebuffer where a subpass has a preserve "