[FIX] purchase_landed_cost: Avoid access error reading act_window

Using `read` for bringing act_window values requires super-admin access.
Let's use `_for_xml_id` instead that is a method specially for that.

TT117299

Author: pedrobaeza

purchase_landed_cost/models/purchase_cost_distribution.py

@@ -467,7 +467,7 @@ def _compute_standard_price_old(self):
     @api.model
     def get_action_purchase_cost_distribution(self):
         xml_id = "purchase_landed_cost.action_purchase_cost_distribution"
-        action = self.env.ref(xml_id).read()[0]
+        action = self.env["ir.actions.act_window"]._for_xml_id(xml_id)
         distributions = self.mapped("distribution")
         if len(distributions) == 1:
             form = self.env.ref("purchase_landed_cost.purchase_cost_distribution_form")