fix/ e2e tests with Spectron

e2e/common-setup.ts

@@ -26,16 +26,13 @@ export default function setup(): void {
       args: [path.join(__dirname, '..')],
       webdriverOptions: {}
     });
-    await this.app.start();
-    const browser = this.app.client;
-    await browser.waitUntilWindowLoaded();
 
-    browser.timeouts('script', 15000);
+    await this.app.start();
   });
 
-  afterEach(function () {
+  afterEach(async function () {
     if (this.app && this.app.isRunning()) {
-      return this.app.stop();
+      await this.app.stop();
     }
   });
 }