Fix Enter key handling in Custom UI and Editors forms

[sebjulliand]

Changes

This PR fixes a small regression introduced by #3083 .

Pressing Enter in a text field in a custom Webview or Editor would make the UI go blank without submitting the form.

Pressing Enter will now:

• submitt the form when working with a Custom Webview (login settings, connection settings, ...)
• do nothing when working with a Custom Editor (action, profile...)

The heading input type has been added to the non-input type of fields. This was causing a silent crash when saving an editor.

How to test this PR

1. Open any custom webview
2. Pressing Enter in a text field must submit the form and close the webview
3. Open an editor (action, profile, ...)
4. Pressing Enter in a text field must do nothing

Checklist

• have tested my change

[github-actions]

👋 A new build is available for this PR based on 8301a15.

• Download here.
• Read more about how to test