Fix component_tests config

[madron]

What does this implement/fix?

This is a fix for the component_tests.
They were not executed and didn't work.

Types of changes

• Bugfix (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 not work as expected)
• Configuration change (this will require users to update their yaml configuration files to keep working)

Test Environment

• ESP32
• ESP8266
• Windows
• Mac OS
• Linux

Explain your changes

I'm planning to develop a new component and I'd like to add some tests for it.
Unluckily this in not possible as the component_tests don't work.

Checklist:

• The code change is tested and works locally.
• Tests have been added to verify that the new code works (under tests/ folder).

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in esphome-docs.

[glmnet]

Thanks