tap action on app buttons with icons doesent work

[Maxakipust]

Checklist:

• [ ] I updated to the latest version available
• [ ] I cleared the cache of my browser

Release with the issue:

Last working release (if known):

Browser and Operating System:

Description of problem:

When configuring an app button with an icon and other config items, the config items dont work. This is because on line 164 you are missing .config=${this._config.apps[index]} Javascript errors shown in the web inspector (if applicable):

Additional information:

[iantrich]

Thanks