feat: add getOrderlines and lines proxy getters to pos_store service

static/src/app/services/pos_store.js

@@ -162,6 +162,14 @@ patch(PosStore.prototype, {
                         if (prop === 'changed_lines_to_print') {
                             return changedLines;
                         }
+                        if (prop === 'getOrderlines') {
+                            return function() {
+                                return changedLines;
+                            };
+                        }
+                        if (prop === 'lines') {
+                            return changedLines;
+                        }
                         let value = Reflect.get(target, prop, receiver);
                         if (typeof value === 'function') {
                             return value.bind(receiver);