[FIX] web_planner: take 'view_type' of action into account

Before this commit, when a planner made a link from an action, the view_type was always 'list'
This prevented the view from being properly loaded, as an action of view_type form wouldn't be recognized

After this commit, such links are well formed, and form view_type actions are correctly loaded

OPW 806758

addons/web_planner/models/web_planner.py

@@ -59,6 +59,7 @@ class Planner(models.Model):
         action = self.env.ref(action_xml_id, False)
         if action:
             params['action'] = action.id
+            params['view_type'] = action.view_type or view_type
         else:
             params['model'] = 'ir.module.module'
         # setting the module