Werk #15878: saml2: resolve login after migrating user to saml2 connector

Component	Setup
Title	saml2: resolve login after migrating user to saml2 connector
Date	May 23, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p6 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Prior to this werk, login with SAML2 failed whenever an existing user was migrated to use the SAML2 connector. This werk fixes this issue.

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