postrm: Removed divert files deletion

The deletion is both unnecessary and a bug: when the package is called with
the purge option, the postrm script is run two times, removing both the new
and the original files.

Signed-off-by: Erik Alexandre Pucci <eap08@c3sl.ufpr.br>
Acked-by: Aryane Ast dos Santos <aras10@c3sl.ufpr.br>