Increase timeout for 2nd phase of Olm session creation
Increase timeout for 2nd phase of Olm session creation

The timeouts on the two phases of olm session creation are 2 and 10
seconds respectively, so sessions will fail if servers take more
than 10s to respond. Now that we have two phases, we can afford to
wait longer on the second one because the user's isn't waiting for
it to finish before the message will send, so increase it to 30s
so servers have more of a chance to respond.

matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk