fix: check if *this is src in Array::operator==

[vil02]

Description

Note that, since this->begin() == src.begin() is equivalent to *this == src, because buf is owned by the Array object.

Checklist

• A description of the changes in this PR is mentioned above.
• All the new and existing tests pass.
• The code follows the code style and conventions of the project.
• No plagiarized, duplicated, or repetitive code that has been directly copied from another source.
• I have read the whole Contributing guidelines of the project and its resources/related pages.

Screenshots (if any)

Note to reviewers

Simplify condition in Array::operator==.

[mertcandav]

LGTM. Thanks for your contribution.