fix: use baseURL for OAuth token endpoint rather tnan separate authURL

[bflorian]

The searate authURL is no longer used in documentation and not guaranteed to be supported in the future. This change only impacts TypeScipt integrations to pre-production SmartThings environments (which require URL overriding). Integrations to the production environment using default URLs are not affected.

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• I have read the CONTRIBUTING document
• My code follows the code style of this project (npm run lint produces no warnings/errors)
• Any required documentation has been added
• I have added tests to cover my changes

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Latest commit: 9bc2d73

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