[FIX] mrp: don't copy locked state

When copying a done MO that is unlocked, the new MO is also unlocked and
the buttons to produce/check availability aren't displayed and it is
confusing to the user.

Fixes odoo#20119

addons/mrp/models/mrp_production.py

@@ -161,7 +161,7 @@ def _get_default_location_dest_id(self):
     scrap_count = fields.Integer(compute='_compute_scrap_move_count', string='Scrap Move')
     priority = fields.Selection([('0', 'Not urgent'), ('1', 'Normal'), ('2', 'Urgent'), ('3', 'Very Urgent')], 'Priority',
                                 readonly=True, states={'confirmed': [('readonly', False)]}, default='1')
-    is_locked = fields.Boolean('Is Locked', default=True)
+    is_locked = fields.Boolean('Is Locked', default=True, copy=False)
     show_final_lots = fields.Boolean('Show Final Lots', compute='_compute_show_lots')
     production_location_id = fields.Many2one('stock.location', "Production Location", related='product_id.property_stock_production')