Fix release script

Change-Id: I1fa7c459c1636a251e3d7094b858c49ee170b8e6
diff --git a/tools/update_prebuilds_in_android.py b/tools/update_prebuilds_in_android.py
index 49a000c..ee2b100 100755
--- a/tools/update_prebuilds_in_android.py
+++ b/tools/update_prebuilds_in_android.py
@@ -80,7 +80,7 @@
   download_path = os.path.join(root, target)
   url = archive.GetUploadDestination(
     hash_or_version,
-    'r8lib.jar.map',
+    target,
     is_hash)
   print 'Downloading: ' + url + ' -> ' + download_path
   utils.download_file_from_cloud_storage(url, download_path)