Fixed errors in windowed_sinc function causing audio distortion
Fixed errors in windowed_sinc function causing audio distortion

- removed needless divide by pi in windowed_sinc
- removed cutoff_freq from windowed_sinc as the cutoff frequency just
  needs to be super super small to get rid of the noise
- removed deviation and set gain to a static number for now
- removed bandwidth as you can't change tuner bandwidth on Linux turns
  out
- rustfmt updates

ostrosco/sdr_tuner