[FIX] gamification: Refresh Challenge

When clicking on the button "Refresh Challenge" in the "gamification.challenge"
view form, all the "gamification.goal" records linked to this challenge must
be updated.

opw:647983

addons/gamification/models/challenge.py

@@ -380,6 +380,9 @@ class gamification_challenge(osv.Model):
 
         Create goals that haven't been created yet (eg: if added users)
         Recompute the current value for each goal related"""
+        goal_obj = self.pool['gamification.goal']
+        goal_ids = goal_obj.search(cr, uid, [('challenge_id', 'in', ids), ('state', '=', 'inprogress')], context=context)
+        goal_obj.unlink(cr, uid, goal_ids, context=context)
         return self._update_all(cr, uid, ids=ids, context=context)
 
     def action_report_progress(self, cr, uid, ids, context=None):