Completed task show up on initial sync, are completed on next

[mchlnix]

When initially syncing, completed tasks are created on HabitRPG as well. They are not checked for completion afterwards.

That means, that already completed tasks get scored only on the next sync.

That is not really a bug, but it might be easy to fix by not returning out of the sync_to_habit function after uploading a task, as long as no other type of task is negatively affected by this change.