The DBList field always proposes the blog introduction first in AWM

The cause come from the fact that the Blog.BlogPostClass is put as default class in the field parameters
https://github.com/xwiki/xwiki-platform/blob/master/xwiki-platform-core/xwiki-platform-appwithinminutes/xwiki-platform-appwithinminutes-ui/src/main/resources/AppWithinMinutes/DBList.xml#L54

When the field is added to the app, the list of articles is automaticly loaded and the first one is selected (normal functioning of the DBList field) and then the template object of the current class is created with this value

It's not a good idea to have an example document from another application here this can lead to confusion. This can make sense only if AWM had a dependency on the blog.

To have an example or to explain how it work, we can add an explicative message or replace the current input by a classes selector.