transmitter: Fix nice unit test for rtcp-muxing. Ignore component 2 ready.
transmitter: Fix nice unit test for rtcp-muxing. Ignore component 2 ready.

Component 2 may become ready before component 1 in which case data
sent to that part of the pipeline will be dropped since cid 1 is not
yet ready, which causes the unit test to fail since data is missing.

tieto/farstream,tieto/farstream,tieto/farstream,tieto/farstream,tieto/farstream