[5.2] Fix JS errors in admin menu

[C-Lodder]

Pull Request for Issue #44408

Summary of Changes

This PR fixes the JS errors being thrown when creating an Admin Menu

Testing Instructions

See original issue

[brianteeman]

I have tested this item ✅ successfully on 8269f58

Thanks @C-Lodder

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[Quy]

I have tested this item ✅ successfully on 8269f58

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/44410.}

[Quy]

RTC

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[Hackwar]

Thanks for your contribution!