Don't enable validation when only debug markers are on

AnKi/Gr/Vulkan/GrManagerImpl.cpp

@@ -290,7 +290,7 @@ Error GrManagerImpl::initInstance()
 		enabledValidationFeatures.emplaceBack(VK_VALIDATION_FEATURE_ENABLE_DEBUG_PRINTF_EXT);
 	}
 
-	if(g_debugPrintfCVar.get() && !g_validationCVar.get())
+	if((g_debugPrintfCVar.get() || g_debugMarkersCVar.get()) && !g_validationCVar.get())
 	{
 		disabledValidationFeatures.emplaceBack(VK_VALIDATION_FEATURE_DISABLE_ALL_EXT);
 	}