bliss: repopick: pick only open changes in a topic

This reduces the pointless spam saying that change X is already merged

Change-Id: If84daeabf00602b1da30543b255097d9335b074f
Signed-off-by: Akhil Narang <akhilnarang.1999@gmail.com>
diff --git a/build/tools/repopick.py b/build/tools/repopick.py
index 46228a2..f99c017 100755
--- a/build/tools/repopick.py
+++ b/build/tools/repopick.py
@@ -274,7 +274,7 @@
             return cmp(review_a['number'], review_b['number'])
 
     if args.topic:
-        reviews = fetch_query(args.gerrit, 'topic:{0}'.format(args.topic))
+        reviews = fetch_query(args.gerrit, 'status:open+topic:{0}'.format(args.topic))
         change_numbers = [str(r['number']) for r in sorted(reviews, key=cmp_to_key(cmp_reviews))]
     if args.query:
         reviews = fetch_query(args.gerrit, args.query)