[FIX] point_of_sale: remove unvalid ACL

The field bank_statement_id was removed at c04065ab
The rule is no longer working and we have no link between a cashbox and a bank
statement anymore.

Fixes #13550

addons/point_of_sale/security/point_of_sale_security.xml

@@ -37,12 +37,6 @@
         <field name="groups" eval="[(4, ref('account.group_account_user'))]"/>
         <field name="domain_force">[(1, '=', 1)]</field>
     </record>
-    <record id="rule_pos_cashbox_line_user" model="ir.rule">
-        <field name="name">Point Of Sale Cashbox Line POS User</field>
-        <field name="model_id" ref="account.model_account_cashbox_line" />
-	    <field name="groups" eval="[(4, ref('group_pos_user'))]"/>
-        <field name="domain_force">[('bank_statement_id.pos_session_id', '!=', False)]</field>
-    </record>
     <record id="rule_pos_cashbox_line_accountant" model="ir.rule">
         <field name="name">Point Of Sale Cashbox Line Accountant</field>
         <field name="model_id" ref="account.model_account_cashbox_line" />