fix(electron): quit entire app if main window is closed

app/electron/electron-wrapper.js

@@ -34,23 +34,17 @@ function createWindow() {
     mainWindow.focus()
   } )
 
+  // Quit when main window is closed
   mainWindow.on( 'closed', () => {
-    // Dereference the window object, usually you would store windows
-    // in an array if your app supports multi windows, this is the time
-    // when you should delete the corresponding element.
     mainWindow = null
+    app.quit()
   } )
 }
 
 app.on( 'ready', createWindow )
 
-// Quit when all windows are closed.
-app.on( 'window-all-closed', () => app.quit() )
-
 app.on( 'activate', () => {
-  if ( mainWindow === null ) {
-    createWindow()
-  }
+  if ( mainWindow === null ) createWindow()
 } )
 
 // Catch any errors