don't need to removeFailed() when suspending

anki/sched.py

@@ -983,7 +983,6 @@ your short-term review workload will become."""))
 
     def suspendCards(self, ids):
         "Suspend cards."
-        self.removeFailed(ids)
         self.col.db.execute(
             "update cards set queue=-1,mod=?,usn=? where id in "+
             ids2str(ids), intTime(), self.col.usn())

tests/test_sched.py

@@ -428,7 +428,6 @@ def test_suspend():
     c.load()
     assert c.queue == 2
     assert c.type == 2
-    assert c.due == 1
 
 def test_cram():
     d = getEmptyDeck()