Fix stuck notes in native MIDI handling #1577

Job	Run time
macos (universal-10.15)	1h 47m 31s
modaudio (modduo, modduo-static, MODDUO=true)	1h 16m 59s
modaudio (modduox, modduox-static)	1h 1m 55s
modaudio (moddwarf, moddwarf)	1h 13m 35s
headless	44m 35s
linux (aarch64)	7m 21s
linux (armhf)	6m 21s
linux (i386)	4m 52s
linux (riscv64)	4m 42s
linux (x86_64)	3m 51s
linux-x86_64-debug	1h 18m 47s
lto	2h 12m 11s
plugin-validation	1h 12m 41s
source-tarball	21m 0s
sysdeps	50m 51s
windows (win32)	1h 8m 24s
windows (win64)	1h 32m 20s
wasm (simd)	1h 11m 54s
wasm (nosimd)	1h 13m 32s
	17h 33m 22s

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