Happy ghast is not scaled down properly when harnessed

Steps to Reproduce:

1. Find or spawn a happy ghast

2. Stand on top of it

3. Closely observe the edges of its model

4. Equip a harness on it

Observed Results:
The harnessed ghast is scaled down too much, to the point that even the harness layer is smaller than the unharnessed model.

Expected Results:
The harnessed ghasts is scaled down in a way that makes the harness layer match the size of the unharnessed model.

Screenshots/Videos attached: Yes

Notes: This is an issue with variable.shrink_scalar not being calculated properly. Instead of being 30.0f / 32.0f, it should be 16.0f / 17.0f, which is equivalent to the happy ghast’s model size divided by the harness' model size.