Don't exclude old items with recent votes from 30-day karma calculations

In other words, if an item is five years old, but was voted on yesterday, the karma change still occurred recently, so it should still be treated as a recent change, regardless of the age of the underlying item.

r2/r2/lib/user_stats.py

@@ -139,7 +139,7 @@ def user_vote_change_links(period=None, user=None):
                     link_dt.c.thing_id == rt.c.thing2_id)
     if period is not None:
         earliest = datetime.now(g.tz) - timedelta(0, period)
-        query.clauses.extend((rt.c.date >= earliest, link_tt.c.date >= earliest))
+        query.clauses.append(rt.c.date >= earliest)
     if user is not None:
         query.clauses.append(author_dt.c.value == str(user._id))
 
@@ -171,7 +171,7 @@ def user_vote_change_comments(period=None, user=None):
                     comment_tt.c.thing_id == rt.c.thing2_id)
     if period is not None:
         earliest = datetime.now(g.tz) - timedelta(0, period)
-        query.clauses.extend((rt.c.date >= earliest, comment_tt.c.date >= earliest))
+        query.clauses.append(rt.c.date >= earliest)
     if user is not None:
         query.clauses.append(author_dt.c.value == str(user._id))