Noise divisor code should not be incremented

[42plamusse]

gameboy/src/apu.rs

Line 998 in 87865c1

n => (u32::from(n) + 1) * 16,

n should not be incremented by 1. Otherwise, by example, if n = 1 you will get a divisor value of 32 instead of the 16 expected.

You can also use this operation instead:

n => u32::from(n) << 4