Instances Count are always 0 on Module Type Table

[mmfreitas]

NetBox version

v3.2.0

Python version

3.9

Steps to Reproduce

1. Create a module type as such:
2. Insert a module of that type on a module bay of any device
3. Go to Module Type page, and check the created module type instances count (it will still display 0)
4. If you enter the module type you'll be able to see the number of instances created, as such:
   

Expected Behavior

The instances column on the module type table should update to how many instances of that module type exist.

Observed Behavior

The instance count doesn't update and is always 0.