Don't write Liked/Disliked timestamps.

We'll just use LinkVote instead. It'll be slightly
inaccurate for one of the two, but it'll be easier
to maintain.

r2/r2/lib/db/queries.py

@@ -1249,10 +1249,8 @@ def handle_vote(user, thing, dir, ip, organic, cheater=False, foreground=False):
 
             #update sup listings
             if dir:
-                timestamps.append('Liked')
                 sup.add_update(user, 'liked')
             elif dir is False:
-                timestamps.append('Disliked')
                 sup.add_update(user, 'disliked')
 
     elif isinstance(thing, Comment):