Fixing Streamlabspolly issue

[dieperdev]

Description

This pull request fixes an issue that was occuring with streamlabspolly. The TTS service now requires an additional referer header set to https://streamlabs.com.

Issue Fixes

Fixes #1942

Checklist:

• I am pushing changes to the develop branch
• I am using the recommended development environment
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have formatted and linted my code using python-black and pylint
• I have cleaned up unnecessary files
• My changes generate no new warnings
• My changes follow the existing code-style
• My changes are relevant to the project

Any other information (e.g how to test the changes)

None