Fix EZP-26168: User profile edits break change password

[paulborgermans]

... and forgot password functionality

See also https://jira.ez.no/browse/EZP-26168

To correct existing records, the contentobject_attribute table needs to be cleared for historical draft data in the data_text column for published objects, for example:

1. View those affected records:

SELECT ezco.id, ezcoa.data_text FROM ezcontentobject ezco, ezcontentobject_attribute ezcoa 
WHERE ezco.id=ezcoa.contentobject_id
 AND ezcoa.data_text <> '' 
 AND ezcoa.data_type_string = 'ezuser' and ezco.status=1;

2. Clear affected records

UPDATE ezcontentobject ezco, ezcontentobject_attribute ezcoa SET ezcoa.data_text='' 
WHERE ezco.id=ezcoa.contentobject_id 
 AND ezcoa.data_text <> '' 
 AND ezcoa.data_type_string = 'ezuser' and ezco.status=1;