Removes initialization from migration

Just doesn't seem right

bookwyrm/management/commands/populate_lists_streams.py

@@ -22,13 +22,6 @@ class Command(BaseCommand):
 
     help = "Populate list streams for all users"
 
-    def add_arguments(self, parser):
-        parser.add_argument(
-            "--stream",
-            default=None,
-            help="Specifies which time of stream to populate",
-        )
-
     # pylint: disable=no-self-use,unused-argument
     def handle(self, *args, **options):
         """run feed builder"""