[Bug] sound_intromusic doesn't support section format

[M60TM]

Description and Reproduce

This form does not work.(sound is not playing)

    "sound_intromusic"
    {
        "freak_fortress_2/blabla/intro_event.mp3"
        {
            "time"  "12"
        }
    }

This form works.

    "sound_intromusic"
    {
        "path1" "freak_fortress_2/blabla/intro_event.mp3"
        "time1" "12"
    }