download_file.py: Synchronize curl options with gerrit core

* "show error even when -s is used" option was added in: I9e7708e6e42.
* "follow redirects" option was added in: Ib14dab2e692.

Change-Id: I034fdbdd3e52c3c1d2e724f6dd9a2665e91be31a
diff --git a/tools/download_file.py b/tools/download_file.py
index ecf00de..534a6d5 100755
--- a/tools/download_file.py
+++ b/tools/download_file.py
@@ -103,7 +103,7 @@
 
   print('Download %s' % src_url, file=stderr)
   try:
-    check_call(['curl', '--proxy-anyauth', '-ksfo', cache_ent, src_url])
+    check_call(['curl', '--proxy-anyauth', '-ksSfLo', cache_ent, src_url])
   except OSError as err:
     print('could not invoke curl: %s\nis curl installed?' % err, file=stderr)
     exit(1)