stream.hls: Remove sequence wrap around handler.

This caused issues with playlists that never removes
segments and was probably not needed anyway.

Fixes #224.

src/livestreamer/stream/hls.py

@@ -261,12 +261,6 @@ def _handle_sequences(self, playlist, sequences):
                 self.sequence = edge_sequence.num
             else:
                 self.sequence = first_sequence.num
-        elif first_sequence.num == 0 and self.sequence > 0:
-            # The sequence number has wrapped around. This should probably not
-            # happen, but it wasn't until draft-pantos-http-live-streaming-12
-            # that it was explicitly stated that sequence numbers should never
-            # decrease.
-            self.sequence = first_sequence.num
 
     def _queue_sequences(self, fillqueue=False):
         for i, sequence in enumerate(self.playlist_sequences):