don't double start; don't try to handle double start.

src/allmydata/client.py

@@ -761,7 +761,6 @@ class _Client(node.Node, pollmixin.PollMixin):
                 s = magic_folder.MagicFolder.from_config(self, name, mf_config)
                 self._magic_folders[name] = s
                 s.setServiceParent(self)
-                s.startService()
 
                 connected_d = self.storage_broker.when_connected_enough(threshold)
                 def connected_enough(ign, mf):

src/allmydata/frontends/magic_folder.py

@@ -402,9 +402,6 @@ class MagicFolder(service.MultiService):
         self._public_status = (status, messages)
 
     def startService(self):
-        # TODO: why is this being called more than once?
-        if self.running:
-            return defer.succeed(None)
         service.MultiService.startService(self)
         return self.uploader.start_monitoring()