Color tag menuitem does not show colors in High Contrast theme - but view does

I have searched open and closed issues for duplicates.

## Describe the bug
The context menuitem for changing color tags does not show the colors if you switch to High Contrast theme. But in the view tag colors are still shown.


### To Reproduce
Steps to reproduce the behavior:
1. Change the Gtk theme to "High Contrast"
2. In FIles, secondary click on a file item to show the context menu
3. The Color tag menu item is monochrome although it does work and color tags are correctly displayed in the view.

### Expected behavior
Either both color tags and the corresponding menuitem should not be shown if the theme is not "elementary" or both color tags and the corresponding menuitem should display properly.

## Platform Information
Hera 5.1 daily

I'm using the latest version from git that I've manually compiled

## Additional context
Unsure whether non-elementary themes are generally supported but this is an accessibility issue.