Make CommentSortsCache use CL ONE for reads.

r2/r2/models/link.py

@@ -833,6 +833,7 @@ class CommentSortsCache(tdb_cassandra.View):
        the candidate order"""
     _use_db = True
     _value_type = 'float'
+    _read_consistency_level = tdb_cassandra.CL.ONE
 
 class StarkComment(Comment):
     """Render class for the comments in the top-comments display in