Runtime 6.10: Remove shared-modules/libusb

libusb is part of the **6.10** base app. Please don't forget to remove it when the app is updated to the related runtime.

```
flatpak run --devel --command=sh org.kde.Platform//6.10

grep libusb -A 5 /usr/manifest*
/usr/manifest-base-1.json: "name": "components/libusb.bst",
/usr/manifest-base-1.json- "x-cpe": {
/usr/manifest-base-1.json: "product": "libusb",
/usr/manifest-base-1.json- "version": "1.0.29"
/usr/manifest-base-1.json- },
/usr/manifest-base-1.json- "sources": [
/usr/manifest-base-1.json- {
/usr/manifest-base-1.json- "type": "git",
/usr/manifest-base-1.json: "url": "https://github.com/libusb/libusb.git",
/usr/manifest-base-1.json- "commit": "v1.0.29-0-g15a7ebb4d426c5ce196684347d2b7cafad862626"
/usr/manifest-base-1.json- }
/usr/manifest-base-1.json- ]
/usr/manifest-base-1.json- },

```

Start by inspecting the app's Flatpak manifest and the shared-modules/libusb reference, then use the provided runtime shell command to confirm libusb appears in /usr/manifest-base-1.json for 6.10. Done means the app no longer includes the shared libusb module after updating to the related runtime.

Written by the indexing model from the issue text.