fix: PFX certs not working (closes #4495)

[JohnCampionJr]

Description

When using PFX files, localhost certs were still being generated.

In addition, Node wanted the passphrase as a buffer.

Fixes #4495

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[sapphi-red]

#4495 (comment)

About passphrase Buffer problem, I think this needs to be confirmed on Node.js side first. It's not clear whether it is a documentation problem or a bug.