Fix elevenLabs config error

[dannaward]

Background

Running speak mode with elevenLabs on not only stable branch but also master fails with a config error like below.

  File "/Users/danna/Desktop/Personal/Auto-GPT/autogpt/speech/eleven_labs.py", line 46, in _setup
    if config.elevenlabs_voice_2_id in voice_options:
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'Config' object has no attribute 'elevenlabs_voice_2_id'. Did you mean: 'elevenlabs_voice_id'?

I just followed the guide on docs, and encountered this issue, so I think either the docs or the code should be updated.

Changes

I saw the commit history in which the elevenlabs_voice_2_id was deleted on .env.template, thus instead of adding it again on config.py, I decided to remove elevenlabs_voice_2_id-related-codes on eleven_labs.py. (I assumed eleven_labs.py is the legacy one here)
It's now all synchronized and is not running into errors anymore.

Documentation

Test Plan

It worked fine on both my local environment and docker.

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes.
• I have run the following commands against my code to ensure it passes our linters:

  black .
  isort .
  mypy
  autoflake --remove-all-unused-imports --recursive --ignore-init-module-imports --ignore-pass-after-docstring autogpt tests --in-place

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[Pwuts]

This can be merged as soon as you put back data/.keep

[dannaward]

@Pwuts Updated!

[Pwuts]

Thanks! :)