Make it configurable whether to have the password confirmation field

[oliverklee]

In some cases, there should only be one password field, an no "repeat password" field. So it would be helpful if it were configurable to (not) have the password repeat field.

[zobnov]

FYI, There is a validation configuration for this, but it does not work for me. I'm using v8 and Typo3 12. Perhaps searching by the config keys will help you find and fix the code.