[FIX] pos_restaurant: edition of table

When you were trying to edit the table map of your pos, you were getting
a traceback because, it was getting information from a table that
is not in the list of table.

So we are now correctly set the table in the list when it is created and
duplicated.

TASK-ID: 2057368

addons/pos_restaurant/static/src/js/floors.js

@@ -216,6 +216,7 @@ var TableWidget = PosBaseWidget.extend({
                         for (var field in table) {
                             self.table[field] = table[field];
                         }
+                        self.pos.tables_by_id[table.id] = self.table;
                         self.renderElement();
                     });
             }, function(type,err) {