fix(downloader): restore requests progress for single-url downloads

unshackle/core/downloaders/requests.py

@@ -260,11 +260,18 @@ def requests(
             },
         )
 
+    # If we're downloading more than one URL, treat them as "segments" for progress purposes.
+    # For single-URL downloads we want per-chunk progress (and the inner `download()` will yield
+    # a chunk-based `total`), so don't set a segment total of 1 here.
+    segmented_batch = len(urls) > 1
+    if segmented_batch:
         yield dict(total=len(urls))
 
     try:
         with ThreadPoolExecutor(max_workers=max_workers) as pool:
-            for future in as_completed(pool.submit(download, session=session, segmented=True, **url) for url in urls):
+            for future in as_completed(
+                pool.submit(download, session=session, segmented=segmented_batch, **url) for url in urls
+            ):
                 try:
                     yield from future.result()
                 except KeyboardInterrupt: