[FIX] base: fix logger message

Simple typo; instead of a logger message, an exception is output in the logs.

closes odoo/odoo#36686

X-original-commit: 83030b6ae20bc9d32b2c7a83ea5a1dca33e5f9cf
Signed-off-by: Nans Lefebvre (len) <len@odoo.com>

odoo/addons/base/models/ir_mail_server.py

@@ -126,7 +126,7 @@ def encode_rfc2822_address_header(header_text):
             return formataddr((name, email))
         except UnicodeEncodeError:
             _logger.warning(_('Failed to encode the address %s\n'
-                              'from mail header:\n%s') % addr, header_text)
+                              'from mail header:\n%s') % (addr, header_text))
             return ""
 
     addresses = getaddresses([pycompat.to_text(ustr(header_text))])