[REF] stock: remove method redirection

Remove redirection of mehod 'action_split_lot' to 'split_lot' introduced in
rev: https://github.com/odoo/odoo/commit/304c81c91

addons/stock/models/stock_pack_operation.py

@@ -206,7 +206,6 @@ class PackOperation(models.Model):
             'target': 'new',
             'res_id': self.ids[0],
             'context': action_ctx}
-    split_lot = action_split_lots
 
     @api.multi
     def show_details(self):

addons/stock/views/stock_picking_views.xml

@@ -265,7 +265,7 @@
                                     <field name="state" invisible="1"/>
                                     <field name="product_qty" readonly="1" attrs="{'required': [('product_id', '!=', False)]}"/>
                                     <field name="qty_done" attrs="{'readonly': [('lots_visible', '=', True)]}"/>
-                                    <button name="split_lot" string="Lot Split" type="object" icon="fa-list" groups="stock.group_production_lot"
+                                    <button name="action_split_lots" string="Lot Split" type="object" icon="fa-list" groups="stock.group_production_lot"
                                             attrs="{'invisible': ['|', ('lots_visible', '=', False), ('state', 'not in', ['confirmed', 'assigned', 'waiting', 'partially_available','done'])]}"/>
                                     <button name="show_details" string="Modify" type="object" icon="fa-pencil" groups="stock.group_stock_multi_locations"
                                             states="confirmed,assigned,waiting,partially_available"/>