repository policy listing by id not working

## Describe the bug

The argument `--repository-id` for `az repos policy` does not work as expected.

**Command Name**
`az repos policy list
Extension Name: azure-devops. Version: 0.17.0.`

**Errors:**
No policy is listed although there are policies applied to that repositry

## To Reproduce:

The two commands below should produce the same output, but only the seconds produces response
```
az repos policy list --project ${project} -o table --repository-id ${id}
az repos policy list --project ${project} -o table | grep ${id}
```

## Expected Behavior

List the policies for the supplied repository id

## Environment Summary
```
Linux-5.4.0-42-generic-x86_64-with-glibc2.29
Python 3.8.2
Shell: bash

azure-cli 2.0.81 *

Extensions:
azure-devops 0.17.0

```