Give virtual command buffer submit event a good name

renderdoc/driver/vulkan/wrappers/vk_queue_funcs.cpp

@@ -183,9 +183,10 @@ bool WrappedVulkan::Serialise_vkQueueSubmit(
 
 		for(uint32_t c=0; c < numCmds; c++)
 		{
-			AddEvent(QUEUE_SUBMIT, "");
 			string name = "[" + ToStr::Get(cmdIds[c]) + "]";
 
+			AddEvent(QUEUE_SUBMIT, "cmd " + name);
+
 			FetchDrawcall draw;
 			draw.name = name;