Saving Icon Configuration Should Trigger Autosave

**To Reproduce**
Steps to reproduce the behavior:

1. Change something in the icon configuration
2. Click on 'save changes' 
3. Reload the browser before the autosave interval has elapsed

=> The changes made in step 1 are gone.

**Expected behavior**
The saved icon configuration is restored after reloading the browser.

**Version**
- Egon: v3.x.x