Fix drop script of stored function for PostgreSQL

[paakmau]

This PR fix a problem:

When running the drop script by ./runDatabaseDestroy.sh sample.postgresql.properties

It will raise ERROR: type "var" does not exist.

Here's the log:

# ------------------------------------------------------------
# Loading SQL file ./sql.postgres/storedProcedureDrops.sql
# ------------------------------------------------------------
drop function if exists bmsql_proc_new_order (integer, integer, integer, integer[], integer[], integer[]);
drop function if exists bmsql_proc_stock_level(integer, integer, integer);
drop function if exists bmsql_proc_payment(integer, integer, integer, integer, integer, varchar(16), decimal(6,2));
drop function if exists bmsql_proc_order_status (integer, integer, integer, var(16));
ERROR: type "var" does not exist
drop function if exists bmsql_cid_from_clast(integer, integer, varchar(16));
drop function if exists bmsql_proc_delivery_bg (integer, integer, integer);