channeldb/db: properly reinit wallet during Wipe

Previously we wouldn't recreate some of the top level buckets that are
now considered expected with our migration logic. This bug was
preexisting, but never surfaced because the other TLB buckets were not
touched by this unit test.

channeldb/db.go

@@ -315,7 +315,7 @@ var topLevelBuckets = [][]byte{
 // database. The deletion is done in a single transaction, therefore this
 // operation is fully atomic.
 func (d *DB) Wipe() error {
-	return kvdb.Update(d, func(tx kvdb.RwTx) error {
+	err := kvdb.Update(d, func(tx kvdb.RwTx) error {
 		for _, tlb := range topLevelBuckets {
 			err := tx.DeleteTopLevelBucket(tlb)
 			if err != nil && err != kvdb.ErrBucketNotFound {
@@ -324,6 +324,11 @@ func (d *DB) Wipe() error {
 		}
 		return nil
 	}, func() {})
+	if err != nil {
+		return err
+	}
+
+	return initChannelDB(d.Backend)
 }
 
 // createChannelDB creates and initializes a fresh version of channeldb. In