Runtime 25.08: Remove shared-modules/libusb

libusb is part of the runtime 25.08. Please don't forget to remove it when the app is updated to the related runtime.

```
flatpak run --devel --command=sh org.freedesktop.Platform//25.08

[📦 org.freedesktop.Platform ~]$ grep -A 5 libusb /usr/manifest.json
"name": "components/libusb.bst",
"x-cpe": {
"product": "libusb",
"version": "1.0.29"
},
"sources": [
{
"type": "git",
"url": "https://github.com/libusb/libusb.git",
"commit": "v1.0.29-0-g15a7ebb4d426c5ce196684347d2b7cafad862626"
}
]
},
```

Inspect the Flatpak packaging files for the shared-modules/libusb reference and compare them with the runtime 25.08 manifest shown in the issue. Remove the libusb component when the app uses that runtime, then verify the generated manifest no longer includes components/libusb.bst.

Written by the indexing model from the issue text.