Fix frontlist failing on pin expiry.

Proximate cause of 500 error on frontpage is that `Query` has no
such method `remove(...)`. Merely removing the line can't guarantee
identical logic, but I'm not quite clear if explicit removal from the
Query pseudo-collection is necessary, or if the final `pins` variable
after `Query.all()` will be appropriately filtered. It appears to
work right in practice, and the risk of expired pins persisting for
one extra pageload for only one user seems relatively minor.

files/routes/front.py

@@ -325,7 +325,6 @@ def frontlist(v=None, sort="hot", page=1, t="all", ids_only=True, ccmode="false"
 						pin.stickied = None
 						pin.stickied_utc = None
 						g.db.add(pin)
-						pins.remove(pin)
 
 
 		if v: pins = pins.filter(Submission.author_id.notin_(v.userblocks))