[FIX] account: report_invoice styling issues in #total table

Steps to reproduce:
- install account
- print any invoice

Previous behavior:
the css rule and classes are ignored on the total table

Current behavior:
displays as intended

This PR fixes two issues:
1/ class attribute was not taken into account anymore ( table-sm )
2/ page-break-inside didn't work

closes #48682
opw-2229181

closes odoo/odoo#50250

X-original-commit: e4b0040a
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>

addons/account/views/report_invoice.xml

@@ -129,7 +129,7 @@
                     <div class="clearfix">
                         <div id="total" class="row">
                             <div t-attf-class="#{'col-4' if report_type != 'html' else 'col-sm-7 col-md-5'} ml-auto">
-                                <table class="table table-sm;page-break-inside: avoid;">
+                                <table class="table table-sm" style="page-break-inside: avoid;">
                                     <tr class="border-black o_subtotal" style="">
                                         <td><strong>Subtotal</strong></td>
                                         <td class="text-right">