Fixed #10033: In the Oracle backend, restored code lost in the aggregation...

Fixed #10033: In the Oracle backend, restored code lost in the aggregation merge that ensured a datetime object is returned for fields known to be datetimes, even when the time part is all zero.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@9747 bcc190cf-cafb-0310-a4f2-bffc1f526a37