Aplication category not working for Education

### What Happened?

Hello!

When some application has category defined as _Education_ in .desktop file, two category items are created: one for _Education_ and another for _Science_, so the applications appears twice in categorized menu.

### Steps to Reproduce

1. Open a .desktop file for some application
2. Change the _Categories_ property to _Education_. Ex: Categories=Education;Languages;KDE;Qt;
3. Click in the system _Applications_ menu and show applications by category.
4. There will be two categories: Education and Science. And the application will appear in both.

### Expected Behavior

Freedesktop.org classifies these categories as different and they should not be duplicated.

https://specifications.freedesktop.org/menu-spec/latest/apa.html

### OS Version

7.x (Horus)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_