Fix deemp_low and deemp_high CLI parameters

[Mikewando]

No description provided.

[Mikewando]

ld-decode stores these parameters in "deemp_coeff"

ld-decode/ld-decode

Line 305 in 212bb31

"deemp_coeff": (args.deemp_low, args.deemp_high),

So of course this mismatch could also be fixed by changing how ld-decode stores them to match how core.py expects them, but that seemed like it might still require core.py changes since I think you could end up with 0 as the default value for both, which is clearly not intended.

[happycube]

Thanks!