Bug 10556: The delivery time is not inserted on adding a supplier.

Bug 10556: The delivery time is not inserted on adding a supplier.

Test plan:
Add/edit a supplier and check that the delivery time is set in DB.

Note: This patch cleans the code (sql query) in order to see easily if a
problem occurred.

Signed-off-by: Paola Rossi <paola.rossi@cineca.it>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit b95c3134a8a38ba430f7d70173f91e055b4fa30e)
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>