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_test.go

@@ -19,6 +19,7 @@ import (
 	"github.com/lightningnetwork/lnd/keychain"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/shachain"
+	"github.com/stretchr/testify/require"
 )
 
 func TestOpenWithCreate(t *testing.T) {
@@ -96,16 +97,13 @@ func TestWipe(t *testing.T) {
 		t.Fatalf("unable to wipe channeldb: %v", err)
 	}
 	// Check correct errors are returned
-	_, err = cdb.FetchAllOpenChannels()
-	if err != ErrNoActiveChannels {
-		t.Fatalf("fetching open channels: expected '%v' instead got '%v'",
-			ErrNoActiveChannels, err)
-	}
-	_, err = cdb.FetchClosedChannels(false)
-	if err != ErrNoClosedChannels {
-		t.Fatalf("fetching closed channels: expected '%v' instead got '%v'",
-			ErrNoClosedChannels, err)
-	}
+	openChannels, err := cdb.FetchAllOpenChannels()
+	require.NoError(t, err, "fetching open channels")
+	require.Equal(t, 0, len(openChannels))
+
+	closedChannels, err := cdb.FetchClosedChannels(false)
+	require.NoError(t, err, "fetching closed channels")
+	require.Equal(t, 0, len(closedChannels))
 }
 
 // TestFetchClosedChannelForID tests that we are able to properly retrieve a