Revert the layer change NOW

[Natagosa-wyrmrest-accord]

@Aggrend-1483

The next set of changes we have on deck are:

• With a hotfix tomorrow we will no longer be dynamically retiring layers. This means that late at night or early in the morning there will be more layers than are needed and the world may feel more empty.

I don’t like the idea of completely getting rid of a sensible and otherwise good system like this. I think if they make it so that the layer manger is paused and doesn’t retire layers during an Ashenvale battle may be a better, more targeted change.