message: Fix issue with matrix.total for knockout
diff: <!-- ko if:question.koTable().showFooter -->
  <tfoot>
  <tr>
  - <!-- ko foreach: question.koTable().footerRow.cells} -->
  + <!-- ko foreach: question.koTable().footerRow.cells -->
  <td>
  <!-- ko if: $data.hasQuestion -->
  <!-- ko template: { name: $data.question.koTemplateName(), data: $data.question, as: 'question' } --><!-- /ko -->
  <!-- /ko -->
  <!-- ko if: $data.hasTitle --><!-- ko template: { name: 'survey-string', data: $data.locTitle } --><!-- /ko --><!-- /ko -->
  - <td>
  + </td>
  <!-- /ko -->
  </tr>
  </tfoot>
  