App Lounge: icons and notifications consistency

Summary

The AppLounge icon seems too small, then 2 kind of icons are used for App Lounge notifications.

Steps to reproduce

Wait for an App Lounge auto update, and install an app.

What is the current behavior?

We have 2 notifications from the same origin where 2 icons are used. Plus the App lounge icon is small, if we compare with other ones.

What is the expected correct behavior?

Same icon for all AppLounge notifications with a consistent size.

Relevant screenshots

cc @rhandros @aude.m