Expired TURN credentials are used if room is open for a long time.

[fancycode]

Steps to reproduce

1. Open Talk room.
2. Leave page open for more than 24 hours.
3. Join call from a restricted network.

Expected behaviour

The call should get established through the TURN server.

Actual behaviour

The TURN credentials are expired and can not be used to authenticate on the TURN server.

There actually is a FIXME note in the code about refreshing the credentials:

spreed/lib/Config.php

Line 248 in f751146

// FIXME add the TTL to the response and properly reconnect then