AttributeError: 'DescriptorWrapper' object has no attribute 'get_queryset'

## Problem

When accessing model's field, `DescriptorWrapper` returns itself as an object, which breaks the logic. See more in examples.

## Environment

- Django Model Utils version: 4.1.1
- Django version: 3.2.8
- Python version: 3.9.1
- Other libraries used, if any:

## Code examples

```py
class A(models.Model):
pass

class B(models.Model):
x = models.ForeignKey(A, on_delete=models.CASCADE)

tracker = FieldTracker(fields=["x"])

# This throws
B.x.get_queryset()
```

Start with the provided B.x.get_queryset() reproduction and inspect how FieldTracker(fields=["x"]) affects the ForeignKey attribute through DescriptorWrapper. Confirm the failure on the stated Django and django-model-utils versions, then verify that accessing B.x no longer returns a DescriptorWrapper that lacks get_queryset.

Written by the indexing model from the issue text.