fix: equality validation of input fields

[SGrueber]

PR Type

[x] Bugfix

What Is the Current Behavior?

Validation of confirmation input fields does not work properly, like the confirmation of the email address or password.

Steps to Repeat

User registration:

1. Enter a value in 1st email address field, e.g. "line1@line1.de"
2. Enter a value in 2nd email address in confirmation field, e.g. "line2@line2.de" -> Validation correctly discovers a mismatch
3. Now enter another value in 1st email address field , e.g. "different1@different1.de" ( which does not match the value in line 2 "line2@line2.de" ) -> The validation is not happening, no mismatch is discovered

What Is the New Behavior?

The validation works properly

Does this PR Introduce a Breaking Change?

[x] No

Other Information

AB#80264