Element.contains does not check itself

[CSchulz]

Describe the bug
The Element contains method does not check if the given element is the element itself resulting in wrong results.

To Reproduce
Pseudo code:

const element = queryElement();
expect(element.contains(element)).toBeTruthy();

Expected behavior
contains should return true if the given element is the same element running the method on.

Device:

• Version 8.7.1

[capricorn86]

Thanks again for the contribution! 🌟

You can read more about the release here:
https://github.com/capricorn86/happy-dom/releases/tag/v8.7.4