[5.3] Remove the reference to the super global

[laoneo]

Summary of Changes

As we move in version 6 to the framework package, the deprecated cookie class should not reference the $_COOKIE superglobal directly with the internal data holder. This makes the transition easier as the framework doesn't use it as well by reference.

Testing Instructions

Log in on the front end with the remember me flag.

Actual result BEFORE applying this Pull Request

It works.

Expected result AFTER applying this Pull Request

It still works.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[QuyTon]

I have tested this item ✅ successfully on ed9f341

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[fgsw]

I have tested this item ✅ successfully on ed9f341

Test by using the prebuilt Package via custom update server.

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[QuyTon]

RTC

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