Fix results layout of assets_search in nuxeo-dam-default

The results layout for the assets_search page provider needs to be fixed in the nuxeo-dam-default project. The current formatting of the file leads to errors when trying to use the Table Editor (saved changes are not persisted and the user is not aware of this behaviour).

Both nuxeo-data-table and nuxeo-results are being closed in the same line (right at the end of the template):

</nuxeo-data-table></nuxeo-results>

But they should be in separate lines:

  </nuxeo-data-table>
</nuxeo-results>

This is important because nuxeo-dam-default is imported in other projects and people try to edit this table using the editor.