Changes the code base to short array syntax

[laoneo]

Changes the whole code base to short array syntax. So we do not have to care anymore about mixed styles in files.

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

[Quy]

I have tested this item ✅ successfully on 03dff68

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