Fix previous post getting first post in database table.
Fix previous post getting first post in database table.

Instead of getting the previous post, the repository was returning
the very first post in the database table.

Signed-off-by: Micheal Mand <4a52646cf58d42dd1882775751ea450b8cf7f96f@kmdwebdesigns.com>

oimken/Blog,oimken/Blog,oimken/Blog