[desktop] Fix stream.end not always being emitted (#2296)

This caused the reference counts to not be zero when we'd go to clear
the cache in `clearPendingUploads`.

Bug introduced in the nightly build, but didn't have any negative impact
except printing an error in the logs because of the unhandled promise
rejection.

Ref: https://github.com/nodejs/node/issues/10871#issuecomment-650150155

desktop/src/main/stream.ts

@@ -115,12 +115,15 @@ const handleRead = async (path: string) => {
 const handleReadZip = async (zipPath: string, entryName: string) => {
     const zip = openZip(zipPath);
     const entry = await zip.entry(entryName);
-    if (!entry) return new Response("", { status: 404 });
+    if (!entry) {
+        markClosableZip(zipPath);
+        return new Response("", { status: 404 });
+    }
 
     // This returns an "old style" NodeJS.ReadableStream.
     const stream = await zip.stream(entry);
     // Convert it into a new style NodeJS.Readable.
-    const nodeReadable = new Readable().wrap(stream);
+    const nodeReadable = new Readable({ emitClose: true }).wrap(stream);
     // Then convert it into a Web stream.
     const webReadableStreamAny = Readable.toWeb(nodeReadable);
     // However, we get a ReadableStream<any> now. This doesn't go into the
@@ -130,7 +133,7 @@ const handleReadZip = async (zipPath: string, entryName: string) => {
         webReadableStreamAny as ReadableStream<Uint8Array>;
 
     // Let go of the zip handle when the underlying stream closes.
-    stream.on("end", () => markClosableZip(zipPath));
+    nodeReadable.on("close", () => markClosableZip(zipPath));
 
     // While it is documented that entry.time is the modification time,
     // the units are not mentioned. By seeing the source code, we can