api: Conform to `cros lint'

Fix formatting issues that cause pylint to complain and preupload hooks
to fail.

BUG=none
TEST=for f in $(find . -path "./gen*" -prune -o -iname "*.py" -print);
do cros lint $f; done
TEST=unit, just for comfort of confirmation

Change-Id: Id770ca57a96c6691b8dce22f019f2f95d7eb2a49
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3277512
Auto-Submit: Lizzy Presland <zland@google.com>
Commit-Queue: Lizzy Presland <zland@google.com>
Tested-by: Lizzy Presland <zland@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/api/compile_build_api_proto.py b/api/compile_build_api_proto.py
index ff6daff..5e7bf8c 100644
--- a/api/compile_build_api_proto.py
+++ b/api/compile_build_api_proto.py
@@ -139,7 +139,7 @@
       git.Clone(chromeos_config_path,
                 '%s/chromiumos/config' % constants.EXTERNAL_GOB_URL,
                 depth=1
-      )
+                )
 
     # Only compile the subset we need for the API.
     subdirs = [