Remove hardcoded resource ID for subscription file parsing

[utils/usubscription-static-file/src/lib.rs](https://github.com/eclipse-uprotocol/up-streamer-rust/blob/750e12d26c8b0b76972747f2b8fbb3b88b5c284a/utils/usubscription-static-file/src/lib.rs#L123)
The resource ID is hardcoded to 0x8001