fix: allow --config and --chain to be used at the same time

[lemmih]

Summary of changes

Changes introduced in this pull request:

• The --config flag and --chain flag must be usable at the same time.
• The way we handle networks is completely broken. This PR is a band-aid solution.

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

[elmattic]

Maybe also remove the combination_of_following_flags_should_fail test.

[lemmih]

Maybe also remove the combination_of_following_flags_should_fail test.

Oops, right. Could have sworn that the tests all passed.

[lemmih]

Maybe also remove the combination_of_following_flags_should_fail test.

Oops, right. Could have sworn that the tests all passed.

Ah, the test doesn't quite test what you meant it to test.