BUG: disappearing message should be set to 1 week on channel creation

CURRENT BEHAVIOR

admin immediately overrides message expiry timer
when a channel is first created, the messageExpiryTime should be set to 1 week by default. we are storing this in the db but never activating it on the channel, thus when the admin sends their first message

DESIRED BEHAVIOR

send a setExpiryTime message immediately after the welcome message to all new admins

Edited Feb 23, 2020 by Mari

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