EZP-22109: Added Places content classes.

Link : https://jira.ez.no/browse/EZP-22109

## Description
Added 2 content classes to ezdemo so they are automatically created when installing.

## Test
Ran install wizard after updating those file in the local package.
I had to manually update the `ezpublish_legacy/var/storage/packages/eZ-systems/ezdemo_classes/.cache/package.php` since I could not get it to be regenerated.