fix (websocket): ErrorEvent constructor should convert arguments before passing to super()

[Uzlopak]

Now the order of operations is comparable to CloseEvent and MessageEvent

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[KhafraDev]

This doesn't fix anything. If it does fix something, we need a test.

[Copilot]

Pull Request Overview

This fix reorders operations in the ErrorEvent constructor to ensure arguments are converted before being passed to the parent constructor, making the implementation consistent with CloseEvent and MessageEvent constructors.

• Moved argument conversion (webidl.converters calls) to occur before the super() call
• Repositioned the webidl.util.markAsUncloneable() call after super() constructor execution

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