[clean] delete unused file

static/src/xml/account_payment.xml

-<?xml version="1.0" encoding="utf-8"?>
-<templates xml:space="preserve">
-
-    <!--  Copyright 2020 Le Filament
-          License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).  -->
-
-    <t t-extend="ShowPaymentInfo">
-        <t t-jquery='div.oe_form_field' t-operation='replace'>
-            <div class="oe_form_field"
-                 style="margin-right: 10px; text-overflow: ellipsis; overflow: hidden; white-space: nowrap;"
-                 t-att-title="line.date_maturity + ' - ' + line.title">
-                <t t-esc="line.date_maturity"></t> - <t t-esc="line.invoice"></t>
-            </div>
-        </t>
-    </t>
-
-</templates>
\ No newline at end of file