Increase duration of chirp sound in playChirp

src/buzz/buzz.cpp

@@ -113,7 +113,7 @@ void playShutdownMelody()
 void playChirp()
 {
     // A short, friendly "chirp" sound for key presses
-    ToneDuration melody[] = {{NOTE_AS3, 18}}; // Short AS3 note
+    ToneDuration melody[] = {{NOTE_AS3, 20}}; // Short AS3 note
     playTones(melody, sizeof(melody) / sizeof(ToneDuration));
 }