ODS: update for libreoffice 7 compatibility with percentage

Now that default cloudooo is updated to LibreOffice 7, this revealed some problems with percentage values in spreadsheet cells, it was apparently working by chance on LibreOffice 5.

This improves erp5_ods_style to use style:style referencing a number:percentage-style through their style:data-style-name attribute.

Because the same thing was missing for dates to follow the input order of datetime fields, this is also handled at the same time.

We could do something similar to support all input styles of float fields, so that we support 1 234.5, 1.234,5 or 1,234.5, but this is not done this time.