Skip IF [TABLE] NOT EXISTS on v4 migrations

We'd like these queries to fail correctly if the tables exist.

migrations/v4.go

@@ -25,7 +25,7 @@ func oauth(db *datastore) error {
 	return wf_db.RunTransactionWithOptions(context.Background(), db.DB, &sql.TxOptions{}, func(ctx context.Context, tx *sql.Tx) error {
 		createTableUsersOauth, err := dialect.
 			Table("oauth_users").
-			SetIfNotExists(true).
+			SetIfNotExists(false).
 			Column(dialect.Column("user_id", wf_db.ColumnTypeInteger, wf_db.UnsetSize)).
 			Column(dialect.Column("remote_user_id", wf_db.ColumnTypeInteger, wf_db.UnsetSize)).
 			ToSQL()
@@ -34,7 +34,7 @@ func oauth(db *datastore) error {
 		}
 		createTableOauthClientState, err := dialect.
 			Table("oauth_client_states").
-			SetIfNotExists(true).
+			SetIfNotExists(false).
 			Column(dialect.Column("state", wf_db.ColumnTypeVarChar, wf_db.OptionalInt{Set: true, Value: 255})).
 			Column(dialect.Column("used", wf_db.ColumnTypeBool, wf_db.UnsetSize)).
 			Column(dialect.Column("created_at", wf_db.ColumnTypeDateTime, wf_db.UnsetSize).SetDefaultCurrentTimestamp()).