le-conf: Change the system codename on /etc/lsb-release back to precise

This file is used to generate the /etc/apt/sources.list file, and if the
system codename is wrong here none of the ubuntu repositories will be found.

Signed-off-by: Lucas Manika Koeb <lmk08@c3sl.ufpr.br>

conf/pacote/etc/lsb-release

-DISTRIB_ID=Linux Educacional
+DISTRIB_ID="Linux Educacional"
 DISTRIB_RELEASE=5.0
-DISTRIB_CODENAME=le5
+DISTRIB_CODENAME=precise
 DISTRIB_DESCRIPTION="Linux Educacional 5.0"