Fix misspelled preference key
Fix misspelled preference key

DouglasHeriot/MIDIApps,krevis/MIDIApps,DouglasHeriot/MIDIApps,krevis/MIDIApps,krevis/MIDIApps,krevis/MIDIApps,DouglasHeriot/MIDIApps,krevis/MIDIApps