test: remove JS logic to update username to debug error

docker/keycloak/extensions-24/themes/src/main/resources/theme/bcgov/login/messages/messages_en.properties

@@ -6,4 +6,3 @@ configureTotpMessage=You need to set up either a mobile, desktop or browser auth
 missingTotpMessage=Please specify One-time code.
 kcLabelWrapperClass=col-md-4
 invalidFederatedIdentityActionMessage=An unexpected error has occurred or you are already logged into IDIR or BCeID and you need to logout or use a fresh browser to continue. Visit <a href="https://github.com/bcgov/sso-keycloak/wiki/Our-Partners-and-Useful-Information#common-login-errors">here</a> to learn more.
-differentUserAuthenticated=You have an active session with a provider <span class="login-err-username"><{0}></span>. Please <a class="instruction-link" href="#">sign out</a> to proceed further.