Problem
---------
In master, XML attributes have been modifed from attrs={'invisible':...}
to invisible=. During the conversion, the condition where not properly
cleaned up.
Objective
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Clean up the XML attributes.
Solution
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Reduce conditions by removing unecessary elements:
- `fiscal_country_codes` always returns at least an empty string.
- All country codes are in capital letters, no need to `lower` them.
task-3493124
closes odoo/odoo#134329
Related: odoo/enterprise#46920
Signed-off-by: Josse Colpaert <jco@odoo.com>