First MIDI note sticky in Zynthian MIDI player

[jpcima]

Observed by two persons in Zynthian community:

Topic: https://discourse.zynthian.org/t/any-lv2-arp-solina-roland-rs-type-string-machines-solved/3627

The one strange new behavior I noted was that when running the Zynthian MIDI file player, the first note would stick as though no note off had been sent. When stuck notes were cleared with a Panic, all subsequent notes from the player seemed to hit their note-off events just fine. Stuck notes were not happening with the previous build.