[core] Fixed order of group member state change before write ready
[core] Fixed order of group member state change before write ready

ethouris/srt,Cinegy/srt,Cinegy/srt,ethouris/srt,Haivision/srt,Haivision/srt,Haivision/srt,Cinegy/srt,Haivision/srt,ethouris/srt,Cinegy/srt,ethouris/srt