Steps to reproduce:
1. Create new ContentType i.e. "News".
2. Add a single Textline field i.e. "Title".
3. Set "Sort children by default by" to "Location priority"
4. Set "Sort children by default in order" to "Descending".
5. Create new News content anywhere.
6. Observe Sub-items sorting order in the Details tab for this content.

Expected result:
Sub-items sorting for new content should have the same value as one that has been set in ContentType.

Actual result:
Sub-items sorting for new content is not the same as one that has been set in this ContentType.

PR: https://github.com/ezsystems/ezplatform-kernel/pull/146