[5.3] Use null coalescing assignment operator for modules and plugins

[joomdonation]

Pull Request for Issue # .

Summary of Changes

This PR uses NullCoalescingOperatorRector rector rule to improve our modules and plugins code using ??= operator. This is done automatically by rector, no manual change included.

Testing Instructions

Code review

Actual result BEFORE applying this Pull Request

Works

Expected result AFTER applying this Pull Request

Works, with cleaner, easier to read code

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 9763cfe

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[joomdonation]

@viocassel As you are familiar with this kind of PR, could you please review this PR as well? Would love to have this final one of this kind merged. Thanks !

[viocassel]

I have tested this item ✅ successfully on 9763cfe

👌 Yes, of course. Somehow I missed testing this PR...

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[QuyTon]

RTC

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[joomdonation]

Great. Thanks @viocassel !