feat(worker.js): clear old job card on restart

Ensure previous job cards are removed when a conversion job is restarted. This change addresses the accumulation of stale job cards in the UI, mitigating clutter and enhancing user experience by only displaying relevant, active jobs.

src/pix360core/static/js/worker.js

@@ -88,6 +88,7 @@ function restartconversion(jobid, title) {
       var interval = setInterval(checkServerForFile, 3000, msg.id, title);
       intervals[msg.id] = interval;
       addcard(msg.id, title);
+      deletecard(jobid);
     },
   });
 }