Minv CelebA example notebook assumes plgmi is first attack in audit list

# Issue
## Problem Description

Minv CelebA example notebook assumes plgmi is first attack in audit list - and will fail on the last cell if it isn't.

## Expected Behavior

The example should be able to function if the user adds more attacks to the audit attack list.

## What Needs to be Done

Change the last cell in the notebook to index the audit config file in a way that works even if plgmi isn't first.