[5.1] Fix TinyMCE media button, frontend edit

[Fedik]

Pull Request for Issue #43344 .

Summary of Changes

Fix the Media button for frontend, in submenu.

Testing Instructions

Please follow #43344

Actual result BEFORE applying this Pull Request

Broken

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

[brianteeman]

I have tested this item ✅ successfully on 30936e0

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43376.}

[carlitorweb]

I have tested this item ✅ successfully on 30936e0

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43376.}

[Quy]

RTC

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43376.}