Cloning Custom Fields does not clone anything

[dreng]

NetBox version

v.3.3.2

Python version

3.9

Steps to Reproduce

1. Navigate to "Other -> Custom Fields"
2. Click any Custom Field in order to show its details
3. Click the green "Clone" button

Expected Behavior

Some values of the cloned Custom Field should be adopted, at least Model(s), Type, Object Type, Required, Filter logic, UI visibility.

Observed Behavior

There's no difference whether you press Clone or Add (in Custom Fields overview). Cloning behaves just like adding a new Custom Field.

[jeremystretch]

It would make sense to enable this for custom links as well.