Add close and refresh keybinds

frontend/wailsjs/go/main/App.d.ts

@@ -3,6 +3,8 @@
 import {main} from '../models';
 import {time} from '../models';
 
+export function Close():Promise<void>;
+
 export function EmptyBill():Promise<main.Bill>;
 
 export function EmptyPayment():Promise<main.Payment>;