[FIX] pos_restaurant: remove floor_id from restaurant.table form view

There is no way to directly create restaurant.table records in the
backend. The only way is through adding it directly to the table_ids
one2many on restaurant.floor and when doing that floor_id is
automatically set.

Closes #8705

addons/pos_restaurant/restaurant_view.xml

@@ -77,7 +77,6 @@
                 <form string="Restaurant Table">
                     <group col="2">
                         <field name="name" />
-                        <field name="floor_id" />
                         <field name="seats" />
                     </group>
                     <group col="4" string="Appearance">