[BUG] `pd dev` does not respect app configuration before launching OAuth

**Describe the bug**
When using `pd dev` with an app that requires at least one custom field, the custom fields are not respected and the OAuth flow starts prematurely.

**To Reproduce**
Steps to reproduce the behavior:
1. Use `pd init source ` to generate a new source in an app directory that requires at least one custom field (aka `shopify`)
2. Include the `shopify` app prop in the source
3. Attempt to deploy or develop the source `pd dev

**Additional context**

PD CLI version 0.2.8