The pydantic to_camel function generates 'e2EeEnabled' (treating 'ee'
as a word boundary) for the field 'e2ee_enabled'. Users writing
'e2eeEnabled' in their config get the default value instead.
Fix: add explicit alias='e2eeEnabled' to override the incorrect
auto-generated alias. Both 'e2eeEnabled' and 'e2ee_enabled' now work.
Fixes#2851
