[FIX] stock_picking_batch: do not confirm multiple times

Commit 324298967cb6 fix the call to _find_auto_batch() by calling
_action_confirm() of the picking _after_ the assignation.

This implies to confirming 2 times the pickings. Which is an issue in
case an automatic orderpoint is searched and triggered. to fullfill the
need in the source location.

This commit change the call to action_confirm() to a call to
_find_auto_batch() only

closes odoo/odoo#117100

X-original-commit: eb6da7009a525665d4608243e260a2d07093abcc
Signed-off-by: William Henrotin (whe) <whe@odoo.com>

addons/stock_picking_batch/models/stock_move.py

@@ -23,5 +23,6 @@ class StockMove(models.Model):
         return res
 
     def _assign_picking_post_process(self, new=False):
-        super(StockMove, self)._assign_picking_post_process(new=new)
-        self.picking_id.action_confirm()
+        super()._assign_picking_post_process(new=new)
+        for picking in self.picking_id:
+            picking._find_auto_batch()