Wrong filename report when ng adding to a single-app Nx workspace

[moniuch]

❤️ for this plugin!

Describe the bug
A minor, one could say cosmetic, issue, but can be misleading to beginners.

To Reproduce
On an Nx/angular single-app wporkspace, meaning:

• there is no angular.json file
• there is just a single app, living at src/app
• there is one project.json and nx.json living at the repo root

When you run this command ng add @netlify-builder/deploy
you get this message in cli

while the actual file that gets modified is project.json

Expected behavior
project.json is should be the cli output

Otherwise once again: ❤️ for this plugin!