build(electron): bump electron to 15.3.0

- refactor Common Js imports to ES6

fixtures/invoicePrint.js

@@ -1,4 +1,4 @@
-module.exports = {
+export default {
   doctype: "PrintFormat",
   name: "Standard Invoice Format",
   for: "SalesInvoice",
@@ -71,4 +71,4 @@ module.exports = {
         {{ frappe.format(doc.terms, 'Text') }}
     </div>
     `
-}
+};

fixtures/standardCOA.js

@@ -1,7 +1,7 @@
-const frappe = require('frappejs');
+import frappe from 'frappejs';
 const _ = frappe._.bind(frappe);
 
-module.exports = {
+export default {
     [_("Application of Funds (Assets)")]: {
         [_("Current Assets")]: {
             [_("Accounts Receivable")]: {
@@ -170,4 +170,4 @@ module.exports = {
         },
         "rootType": "Equity"
     }
-}
+};