Mark secondaries as submitted so we don't leak secondary command buffers

util/test/demos/vk/vk_pixel_history_test.cpp

@@ -461,7 +461,7 @@ void main()
       FinishUsingBackbuffer(cmd, VK_ACCESS_TRANSFER_WRITE_BIT, VK_IMAGE_LAYOUT_GENERAL);
 
       vkEndCommandBuffer(cmd);
-      Submit(0, 1, {cmd});
+      Submit(0, 1, {cmd}, secondaries);
 
       Present();
     }