[4.2] Minor patch for the currentModal

[dgrammatiko]

Pull Request for Issue # .

Summary of Changes

• The current code saves the open modal reference to Joomla.current instead of Joomla.Modal.current
• The current code works as the Joomla.current is not referenced by any other API, but it shouldn't be used for the modals

Testing Instructions

• Create a new article and test adding an intro and a full image, selecting a user for the article and try using the XTD-buttons (insert Article, Menu, Module, Media).
• All modals open and close correctly

Actual result BEFORE applying this Pull Request

Works

Expected result AFTER applying this Pull Request

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

[Fedik]

Please update also the incorrect comment

joomla-cms/build/media_source/system/js/core.es6.js

Lines 114 to 118 in 6cd61cb

	* USAGE (assuming that exampleId is the modal id)
	* To get the current modal element:
	* Joomla.Modal.current; // Returns node element, eg: document.getElementById('exampleId')
	* To set the current modal element:
	* Joomla.Modal.setCurrent(document.getElementById('exampleId'));

It should be used Joomla.Modal.getCurrent().

[dgrammatiko]

@Fedik done

[carlitorweb]

Remember for the other tester use after apply the patch, npm run build:js

[carlitorweb]

I have tested this item ✅ successfully on 385efc0

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[Quy]

I have tested this item ✅ successfully on 385efc0

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/39450.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/39450.}

[fancyFranci]

Thanks for cleaning this up!