Fix resume bug, stop trying to avoid resuming

Turns out trying to not resume in-progress Scrobbles is super painful.
Maybe I'll come up with a better idea later, but for now, I'd rather
just resurrect old paused scrobbles of past tracks, rather than
completely mess up all other aspects of scrobbling.

vrobbler/apps/podcasts/models.py

@@ -35,7 +35,6 @@ class Podcast(TimeStampedModel):
 
 
 class Episode(ScrobblableMixin):
-    RESUME_LIMIT = getattr(settings, 'PODCAST_RESUME_LIMIT', 180 * 60)
     COMPLETION_PERCENT = getattr(settings, 'PODCAST_COMPLETION_PERCENT', 90)
 
     podcast = models.ForeignKey(Podcast, on_delete=models.DO_NOTHING)