Whatsdesk not changing icon

### Specifications
- Hardcode-Tray version : `4.3`
- Distribution : `KDE Neon`
- Gtk version : `3.24`
- Inkscape version : `1.1.2`
- Application name : `Whatsdesk`
- Application version : `0.3.9`

### Expected behavior
1. Execute sudo -E hardcode-tray --dark-theme Papirus-Dark --light-theme Papirus-Light
2. Choose option number 1
3. Whatsdesk applied
4. New systray icon applied


### Actual behavior
1. Execute sudo -E hardcode-tray --dark-theme Papirus-Dark --light-theme Papirus-Light
2. Choose option number 1
3. Whatsdesk applied
4. Open Whatsdesk and icon remains the same


Tell me if you need more info,

I already checked the gitlab repo and the path seems to be correct https://gitlab.com/zerkc/whatsdesk/-/tree/master/src/icon

Also checked the whatsdesk database json file and it seems right but, somehow, the icon don't change as expected.

Thanks!!

Start by reproducing the reported command on KDE Neon with Whatsdesk, then inspect the Whatsdesk database JSON entry and the icon path it selects. Compare the applied tray icon with the icon in the Whatsdesk repository; done means the Whatsdesk tray icon changes correctly for the selected theme.

Written by the indexing model from the issue text.