configurator_standard_trade_template: use "Simple" solver for split & defer

The difference between Quantity Split Solver and Simple Quantity Split Solver
is that Quantity Split Solver asks user to select how to dispatch the
divergence on multiple deliveries, but in erp5_configurator_standard's
configuration builders are configured to buildout one packing list for each
order, so there will not be cases where this actually makes a difference.

So use the Simple version, which is easier to use for simple cases (which are
the target for erp5_configurator_standard)

bt5/erp5_configurator_standard_trade_template/PathTemplateItem/portal_rules/new_delivery_simulation_rule/quantity_tester.xml

@@ -50,7 +50,7 @@
             <value>
               <tuple>
                 <string>solver/portal_solvers/Accept Solver</string>
-                <string>solver/portal_solvers/Quantity Split Solver</string>
+                <string>solver/portal_solvers/Simple Quantity Split Solver</string>
               </tuple>
             </value>
         </item>