fix(pyramid): Redirect to the wanted URL after a successfully loggedin
The postlogin_path was missing from the login form since the modification from the changeset fc7ccd718d86.
When the user is not logged and try to access a specific route (eg. /cwsource) the postlogin_path parameter allows to redirect to this page when the log form was successfull.
Related to #584 (closed)
--HG-- branch : 3.37