[6.0] Add "chosen" dummy asset to plg_behaviour_compat6 asset

[Fedik]

Pull Request for Issue #46290 .

Summary of Changes

Add "chosen" dummy asset to plg_behaviour_compat6 asset.
Was forgotten in:

• [6.0] Remove chosen #45018

Testing Instructions

Code review.

Or enable "Backward Compatibility" and add $wa->useScript('chosen'); in index.php of the site/admin template.

Actual result BEFORE applying this Pull Request

An error

Expected result AFTER applying this Pull Request

No error.

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

[dgrammatiko]

I have tested this item ✅ successfully on abe5afa

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[richard67]

I have tested this item ✅ successfully on abe5afa

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[richard67]

RTC

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[softforge]

Thank you @Fedik and all who tested