[FIX] sale: sale_coupon isn't an enterprise module anymore

addons/sale/views/res_config_settings_views.xml

@@ -92,7 +92,7 @@
                        </div>
                         <div class="col-12 col-lg-6 o_setting_box" title="Boost your sales with two kinds of discount programs: promotions and coupon codes. Specific conditions can be set (products, customers, minimum purchase amount, period). Rewards can be discounts (% or amount) or free products.">
                             <div class="o_setting_left_pane">
-                                <field name="module_sale_coupon" widget="upgrade_boolean"/>
+                                <field name="module_sale_coupon"/>
                             </div>
                             <div class="o_setting_right_pane">
                                 <label for="module_sale_coupon"/>