stop checking for updated info when upload is complete

static/js/download.js

@@ -1,14 +1,19 @@
+let updateInterval;
+
 document.addEventListener("DOMContentLoaded", () => {
     const table = document.getElementById("download_contents").getElementsByTagName("tbody")[0];
     if (table.children.length === 0) { return; }
 
-    setInterval(() => {
+    updateInterval = setInterval(() => {
         fetch(`info?code=${CODE}`)
             .then((res) => res.json())
             .then((info) => {
                 for (const [index, offset] of info.offsets.entries()) {
                     table.children[index].className = (offset > info.available) ? "unavailable" : "";
                 }
+                if (info.available === info.file.size) {
+                    clearInterval(updateInterval);
+                }
             });
     }, 5000);
 });