Fix hardcoded use of ciphersuite 1 when switching to mixed protocol #4048
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Ciphersuite 1 was still used as the hardcoded ciphersuite for the newly created MLS group after a proteus → mixed transition. This made it impossible to use other ciphersuites for the MLS part of a mixed conversation.
https://wearezeta.atlassian.net/browse/WPB-9142
Checklist
changelog.d