[FIX] stock: remove boolean widget on signature binary field

Before this commit: when writing something in signture field in stock.picking
and enable signature field in listview throws traceback.

After this commit: when signature field is set and enabling it in list view
will not throw traceback, traceback was generated because boolean field
was applied on Image field, to fix it simply remove boolean widget on
signature field.

task-2570929

closes odoo#72479

X-original-commit: 2679b67
Signed-off-by: Arnold Moyaux <amoyaux@users.noreply.github.com>

addons/stock/views/stock_picking_views.xml

@@ -189,7 +189,7 @@
                     <field name="location_id" options="{'no_create': True}" string="From" groups="stock.group_stock_multi_locations" optional="show"/>
                     <field name="location_dest_id" options="{'no_create': True}" string="To" groups="stock.group_stock_multi_locations" optional="show"/>
                     <field name="partner_id" optional="show"/>
-                    <field name="signature" string="Signed" optional="hide" widget="boolean" groups="stock.group_stock_sign_delivery"/>
+                    <field name="signature" string="Signed" optional="hide" groups="stock.group_stock_sign_delivery"/>
                     <field name="user_id" optional="hide" widget="many2one_avatar_user"/>
                     <field name="scheduled_date" optional="show" widget="remaining_days" attrs="{'invisible':[('state', 'in', ('done', 'cancel'))]}"/>
                     <field name="date_deadline" optional="hide" widget="remaining_days" attrs="{'invisible':[('state', 'in', ('done', 'cancel'))]}"/>