[FIX] point_of_sale: remove references to pos_loyalty

Was causing issues when clicking on Settings. pos_loyalty was moved to
enterprise in 9f1cb9ed97.

addons/point_of_sale/res_config.py

@@ -10,11 +10,6 @@ class pos_configuration(osv.TransientModel):
             (1, "Restaurant: activate table management")
             ], "Restaurant",
             help='This module adds several restaurant features to the Point of Sale: \n\n- Bill Printing: Allows you to print a receipt before the order is paid \n\n- Bill Splitting: Allows you to split an order into different orders \n\n- Kitchen Order Printing: allows you to print orders updates to kitchen or bar printers'),
-        'module_pos_loyalty': fields.selection([
-            (0, "No loyalty programs"),
-            (1, "Use loyalty programs")
-            ], "Loyalty",
-            help='Allows you to define a loyalty program in the point of sale, where the customers earn loyalty points and get rewards'),
         'module_pos_discount': fields.selection([
             (0, "Allow discounts on order lines only"),
             (1, "Allow global discounts")

addons/point_of_sale/res_config_view.xml

@@ -12,7 +12,6 @@
                     </header>
                     <group string="Point of Sale">
                         <field name="module_pos_restaurant" widget="radio"/>
-                        <field name="module_pos_loyalty" widget="radio"/>
                         <field name="module_pos_discount" widget="radio"/>
                         <field name="module_pos_mercury" widget="radio"/>
                         <field name="module_pos_reprint" widget="radio"/>