LibWeb/Geometry: Implement "other than none" keyword check in DOMMatrix init

[tannerdrake-dev]

This implementation leads to passing more WPT tests. Relevant test imported in this PR.

[ladybird-bot]

Hello!

One or more of the commit messages in this PR do not match the Ladybird code submission policy, please check the lint_commits CI job for more details on which commits were flagged and why.
Please do not close this PR and open another, instead modify your commit message(s) with git commit --amend and force push those changes to update this PR.

[tcl3]

Hi, thanks for working on this! The change itself looks OK to me, but we try to avoid adding commits that modify work done in previous commits. All the changes made in this PR should be squashed into the first commit, then I think this should be good to go. Feel free to ask on Discord if you need help with this.

[tannerdrake-dev]

Hi, thanks for working on this! The change itself looks OK to me, but we try to avoid adding commits that modify work done in previous commits. All the changes made in this PR should be squashed into the first commit, then I think this should be good to go. Feel free to ask on Discord if you need help with this.

Thanks for the review. I have squashed the commits down to one as requested.

[gmta]

Your commit message is now an amalgamation of the individual commit titles that existed before the squash. You should write a proper commit message instead.

[tannerdrake-dev]

Your commit message is now an amalgamation of the individual commit titles that existed before the squash. You should write a proper commit message instead.

Commit message has been updated to just the proper original message.