[4.1] Fix TinyMCE height for multiple editor instances

[Fedik]

Summary of Changes

Fix TinyMCE height for multiple editor instances.
This a little thing that misses after #37603 to make Height work correctly.

Testing Instructions

Apply patch, create multiple editor instances somwhere, example add in mod_custom:

<field type="editor" name="editor1" label="Editor 1" height="300"/>
<field type="editor" name="editor2" label="Editor 2" height="800"/>

And edit mod_custom content.

Actual result BEFORE applying this Pull Request

Main editor height: 550 (default, from plugin)
Editor 1 height: 550
Editor 2 height: 550

Expected result AFTER applying this Pull Request

Main editor height: 550 (default, from plugin)
Editor 1 height: 300
Editor 2 height: 800

Documentation Changes Required

none

[viocassel]

I have tested this item ✅ successfully on 3f81350

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[Quy]

I have tested this item ✅ successfully on 3f81350

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/37964.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/37964.}

[laoneo]

Would be good if we have also one test which does the instructions from #37603 just to be sure there is no regression.

[Fedik]

@laoneo it covered by current test instructions, you can check and will see 😉

[laoneo]

Not all of them. Like the editor instance.

[Fedik]

All of them

[bembelimen]

Thx