Do not remember choice in pdata when redirecting user for logout
For example in CAS protocol, the user is redirected back to the CAS server when the logout has ended. When LL::NG is a CAS client configured with Choice, we get well redirected to CAS server, but the CAS authentication is remembered, so when using the portal page, we are always redirected back to CAS server, we can not select another authentication Choice.
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