sweepbatcher: fix spawning condition "unattached" spend notifiers

Previously, when handling a sweep we assumed that if a sweep status
was completed, the parent batch was also finished. However, since the
batch confirmation status depends on three on-chain confirmations, it
is possible that a spend notifier was started for a sweep of an active
batch. The notifier would fetch the parent batch from the database, but
because we incorrectly assumed that  the parent was confirmed (when it
was not), the DB call would fail with a 'no rows returned' error.
This failure would cause the sweep to fail and the sweep batcher to
stop, resulting in a permanent failure state.

loopdb/sqlc/batch.sql.go

@@ -102,10 +102,6 @@ JOIN
         sweeps ON sweep_batches.id = sweeps.batch_id
 WHERE
         sweeps.swap_hash = $1
-AND
-        sweeps.completed = TRUE
-AND
-        sweep_batches.confirmed = TRUE
 `
 
 func (q *Queries) GetParentBatch(ctx context.Context, swapHash []byte) (SweepBatch, error) {

loopdb/sqlc/queries/batch.sql

@@ -73,11 +73,7 @@ FROM
 JOIN
         sweeps ON sweep_batches.id = sweeps.batch_id
 WHERE
-        sweeps.swap_hash = $1
-AND
-        sweeps.completed = TRUE
-AND
-        sweep_batches.confirmed = TRUE;
+        sweeps.swap_hash = $1;
 
 -- name: GetBatchSweptAmount :one
 SELECT