JACK host: Calculate correct index for the MIDI indicator even when VU meters are disabled.
JACK host: Calculate correct index for the MIDI indicator even when VU meters are disabled.

jnetterf/calf,adiknoth/calf,jnetterf/calf,jnetterf/calf,adiknoth/calf,jnetterf/calf,adiknoth/calf,adiknoth/calf,adiknoth/calf,jnetterf/calf