Work around ODCS creating COMPOSE_ID later
    
    When ODCS starts a compose, it will provide base composeinfo file, but
    it doesn't create COMPOSE_ID. This leads to a crash when updating CTS,
    since the compose id can't be read from the file. We can instead use the
    value we already have in memory.
    
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>