Email notifications on user settings page should not collapse

Targetted at 11.0.0

Problem/Motivation

In #3062716: Collapse email notification digest settings by default we tried to clean up the email notifications section. While doing so we made all the individual categories collapsible which already made the form a lot cleaner. However, we went a step further and made the containing card collapsible too.

The problem that this causes is that when a user wants to change their email notification settings they now need to click twice before they can even change a setting.

Steps to reproduce

Proposed resolution

Don't collapse the outer card. The screen estate that it takes up is needed to explain to users what it does and the categories being collapsed already saves enough screen space.

Remaining tasks

User interface changes

Before:

After:

API changes

Data model changes