Don't reset 'products finished' counter when replacing building with higher quality one

[Aardwolf]

TL;DR

When replacing a building with one of the same type but different quality, preserve the 'products finished' counter rather than resetting it to 0 as it does now, in v2.0.55

What?

Currently e.g. when replacing a Epic assembly machine 3 with a Legendary assembly machine 3, it resets the counter to 0. It would be nice if the products finished counter would be preserved in this case

Why?

It does preserve the counter when changing modules, or even recipe, so allowing to upgrade the quality of your factory without resetting the counters would be really nice, since it's still the same building in the same factory pipeline.

You're only increasing the speed of production when replacing it with the same building of the same quality, so there's a strong argument to keep the counter the same rather than reset it to 0