[IMP] pos_restaurant: remove start category in demo data

Prior to this commit, the demo restaurant had a start category but
this is not wanted anymore. We thus remove this start category.

closes odoo/odoo#142212

Signed-off-by: David Monnom (moda) <moda@odoo.com>
Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>

addons/pos_restaurant/data/pos_restaurant_demo.xml

@@ -288,8 +288,6 @@
         <!-- Pos Config -->
         <record model="pos.config" id="pos_config_main_restaurant">
             <field name="iface_printbill">True</field>
-            <field name="iface_start_categ_id" ref="food" />
-            <field name="start_category">True</field>
             <field name="limit_categories">True</field>
             <field name="iface_available_categ_ids"
                 eval="[(6, 0, [ref('drinks'), ref('food')])]" />

addons/pos_restaurant/data/pos_restaurant_onboarding_main_config.xml

@@ -3,8 +3,6 @@
     <record model="pos.config" id="pos_config_main_restaurant">
         <field name="name">Restaurant</field>
         <field name="iface_printbill">True</field>
-        <field name="iface_start_categ_id" ref="food" />
-        <field name="start_category">True</field>
     </record>
 
     <!-- Closed Sessions -->