Build API: Fix FEATURES default.

BUG=None
TEST=run_tests

Change-Id: Ifbf98cd7ffe9a27bc8906bd12d3a0ffeebe46b85
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/1611010
Reviewed-by: David Burger <dburger@chromium.org>
Commit-Queue: Alex Klein <saklein@chromium.org>
Tested-by: Alex Klein <saklein@chromium.org>
diff --git a/scripts/build_api.py b/scripts/build_api.py
index 49efe94..4a18b7f 100644
--- a/scripts/build_api.py
+++ b/scripts/build_api.py
@@ -356,9 +356,11 @@
     env = {}
     if use_flags:
       env['USE'] = ' '.join(use_flags)
+
+    # TODO(saklein) Remove the default when fully integrated in recipes.
+    env['FEATURES'] = 'separatedebug'
     if features:
-      # TODO(saklein) Remove the default when fully integrated in recipes.
-      env['FEATURES'] = ' '.join(features) or 'separatedebug'
+      env['FEATURES'] = ' '.join(features)
 
     return env