[FIX] l10n_it_edi: law reference field should always be visible

Taxes on self-invoices for non-EU export actually have amount > 0,
l10n_it_has-exoneration = False but they must have the law reference
field filled out, so we're taking the "invisible" clause
out of the view.

Task: https://www.odoo.com/web#id=3010849&model=project.task
opw-3010849

closes odoo/odoo#105238

X-original-commit: cdb90133ae463f62ade82f67ac89293e09b69740
Signed-off-by: Josse Colpaert <jco@odoo.com>
Signed-off-by: Paolo Gatti (pgi) <pgi@odoo.com>

addons/l10n_it_edi/data/invoice_it_template.xml

@@ -171,7 +171,7 @@
                         <Imposta t-out="format_monetary(abs(tax_line['tax_amount']), currency)"/>
                     </t>
                     <EsigibilitaIVA t-if="not has_exoneration or kind_exoneration == 'N6'" t-out="tax.l10n_it_vat_due_date"/>
-                    <RiferimentoNormativo t-if="has_exoneration" t-out="format_alphanumeric(tax.l10n_it_law_reference[:100])"/>
+                    <RiferimentoNormativo t-if="tax.l10n_it_law_reference" t-esc="format_alphanumeric(tax.l10n_it_law_reference[:100])"/>
                 </DatiRiepilogo>
             </t>
         </DatiBeniServizi>

addons/l10n_it_edi/views/l10n_it_view.xml

@@ -13,7 +13,7 @@
                         <field name="l10n_it_vat_due_date"/>
                         <field name="l10n_it_has_exoneration"/>
                         <field name="l10n_it_kind_exoneration" attrs="{'invisible': [('l10n_it_has_exoneration', '=', False)]}"/>
-                        <field name="l10n_it_law_reference" attrs="{'invisible': [('l10n_it_has_exoneration', '=', False)]}"/>
+                        <field name="l10n_it_law_reference"/>
                     </group>
                 </group>
             </xpath>