[FIX] stock: fix unreserve

In the original commit 19116cc878, `action_assign` was called
on all `move_ids`. However, after API conversion, moves are filtered.

Closes #25886
opw-1868834

addons/stock/models/stock_picking.py

@@ -784,8 +784,9 @@ class Picking(models.Model):
         else:
             moves = self.env['stock.move'].browse(move_ids)
             if self.env.context.get('no_state_change'):
-                moves = moves.filtered(lambda m: m.reserved_quant_ids)
-            moves.do_unreserve()
+                moves.filtered(lambda m: m.reserved_quant_ids).do_unreserve()
+            else:
+                moves.do_unreserve()
             moves.action_assign(no_prepare=True)
 
     @api.multi