fix sv1-mining-device handle_notify manipulation of job_id

roles/test-utils/sv1-mining-device/src/job.rs

@@ -25,9 +25,7 @@ pub(crate) struct Job {
 
 impl Job {
     pub fn from_notify(notify_msg: server_to_client::Notify<'_>, extranonce: Vec<u8>) -> Self {
-        // TODO: Hard coded for demo. Should be properly translated from received Notify message
-        // Right now, Notify.job_id is a string, but the Job.job_id is a u32 here.
-        let job_id = 1u32;
+        let job_id = notify_msg.job_id.parse::<u32>().expect("expect valid job_id on String");
 
         // Convert prev hash from Vec<u8> into expected [u32; 8]
         let prev_hash_vec: Vec<u8> = notify_msg.prev_hash.into();