[FIX] account: deduplicate the date string on invoice/refund PDF

Fixup of 706db8a7

closes odoo/odoo#102558

Signed-off-by: Florian Gilbert (flg) <flg@odoo.com>

addons/account/views/report_invoice.xml

@@ -24,7 +24,7 @@
                     <div id="informations" class="row mt32 mb32">
                         <div class="col-auto mw-100 mb-2" t-if="o.invoice_date" name="invoice_date">
                             <t t-if="o.type == 'out_invoice'"><strong>Invoice Date:</strong></t>
-                            <t t-if="o.type == 'out_refund'"><strong>Credit Note Date:</strong></t>
+                            <t t-elif="o.type == 'out_refund'"><strong>Credit Note Date:</strong></t>
                             <t t-else=""><strong>Date:</strong></t>
                             <p class="m-0" t-field="o.invoice_date"/>
                         </div>