[6.0] Remove the client id in the model cleanCache function

[laoneo]

Summary of Changes

Removes the client id attribute in the form models cleanCache function.

Code review.

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: Remove the client id in the model cleanCache function Manual#347

• No documentation changes for manual.joomla.org needed

[QuyTon]

I have tested this item ✅ successfully on 88a6359

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[Bodge-IT]

I have tested this item ✅ successfully on 0ee0343

Tested on nightly 04/02. cache functions as expected.

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