Fixing references to habitat settings

[jwoertink]

Purpose

Fixes #1685

Description

When a module creates a Habitat config, it will create both an instance and a class method called settings. If you include more than 1 module with habitat settings, then the last included one ends up overriding the previous ones.

This fixes the two areas where these could collide.

Checklist

• - An issue already exists detailing the issue/or feature request that this PR fixes
• - All specs are formatted with crystal tool format spec src
• - Inline documentation has been added and/or updated
• - Lucky builds on docker with ./script/setup
• - All builds and specs pass on docker with ./script/test