le-proinfodata: Add trigger to /etc/userful/script/PostLogin

This is important to make sure the links are created if the package
le-multiterminal is installed after le-proinfodata.

Signed-off-by: Diego Giovane Pasqualin <dpasqualin@c3sl.ufpr.br>

le-proinfodata/package/DEBIAN/triggers

 interest /etc/lightdm
+interest /etc/userful/scripts/PostLogin