firewire-speakers: fix needless modification

'stream_running' member in structure is removed at:
20b65dd040ce38e2bc0fa3cae13b954c865b61fe

But my patch 0001 regain it. This is my fault.
preparation to merge speakers and oxfw
speakers: move to its own directory
speakers: make header file
speakers: add speakers_stream
speakers: add speakers_pcm
speakers: add speakers_control
speakers: change the way to make pcm rules/constraints
speakers: change the way to start stream
speakers: add name_card()
speakers: add command
speakers: add devices
speakers: support PCM capture
speakers: add midi support
speakers: add hwdep
oxfw: remove oxfw stuffs because merged into firewire-speakers