Monster actor encumbrance isn't calculated

[cole-flandorfer]

Enabling the inventory for a monster actor (mostly relevant for storing items on beasts of burden like mules), the weight of items in their inventory isn't totaled, the counter is just always "0/1600" and players have to total up the weight themselves.

I am using the "detailed" encumbrance system. Issue exists in the "classicfantasy" mules as well as the "ose-advancedfantasytome" mules.

It also would be nice to correct the encumbrance limit or at least be able to manually modify the total and/or limits.
For example a Mule should get a movement penalty at 2000 coins and can carry a maximum of 4000 coins worth of weight.