[5.0] Fix codemirror height

[Fedik]

Pull Request for Issue # .

Summary of Changes

Fix codemirror height

Testing Instructions

Set default editor to codemirror,
Go to Article editing

Actual result BEFORE applying this Pull Request

Editor height 100px

Expected result AFTER applying this Pull Request

Editor height 500px

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 a304b5e

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/41432.}

[viocassel]

I have tested this item ✅ successfully on a304b5e

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/41432.}

[HLeithner]

thanks