test: use webContents.create() in type-safe way (#37281)

test: use (webContents as typeof ElectronInternal.WebContents).create()

Co-authored-by: Milan Burda <miburda@microsoft.com>

spec/fixtures/crash-cases/webcontents-create-leak-exit/index.js

@@ -1,6 +1,6 @@
 const { app, webContents } = require('electron');
 app.whenReady().then(function () {
-  webContents.create({});
+  webContents.create();
 
   app.quit();
 });