Further improve calculation of when to use wide residual computation

[ktmf01]

This takes #700 one step further

In the following dataset, ./current is a binary without this PR and #700, ./mulbits is without this PR but with #700 and ./betterbps is including this PR. Testdata is the same as for #700: an upsampled set of short samples. Results are most pronounced for -5p on 24-bit material, see emphasis.

Command	Mean [s]	Min [s]	Max [s]	Relative
./betterbps -5 -j2 -c ../Rarewares-16bit.flac	1.214 ± 0.014	1.197	1.238	1.00
./mulbits -5 -j2 -c ../Rarewares-16bit.flac	1.223 ± 0.010	1.207	1.237	1.01 ± 0.01
./current -5 -j2 -c ../Rarewares-16bit.flac	1.217 ± 0.024	1.177	1.256	1.00 ± 0.02
./betterbps -5p -j2 -c ../Rarewares-16bit.flac	1.504 ± 0.035	1.463	1.552	1.24 ± 0.03
./mulbits -5p -j2 -c ../Rarewares-16bit.flac	1.495 ± 0.030	1.457	1.538	1.23 ± 0.03
./current -5p -j2 -c ../Rarewares-16bit.flac	1.497 ± 0.033	1.457	1.557	1.23 ± 0.03
./betterbps -8 -j2 -c ../Rarewares-16bit.flac	2.025 ± 0.014	2.005	2.050	1.67 ± 0.02
./mulbits -8 -j2 -c ../Rarewares-16bit.flac	2.002 ± 0.015	1.979	2.023	1.65 ± 0.02
./current -8 -j2 -c ../Rarewares-16bit.flac	2.011 ± 0.033	1.961	2.056	1.66 ± 0.03
./betterbps -8p -j2 -c ../Rarewares-16bit.flac	6.172 ± 0.050	6.107	6.285	5.08 ± 0.07
./mulbits -8p -j2 -c ../Rarewares-16bit.flac	6.176 ± 0.098	6.087	6.356	5.09 ± 0.10
./current -8p -j2 -c ../Rarewares-16bit.flac	6.297 ± 0.076	6.194	6.401	5.19 ± 0.09
./betterbps -5 -j2 -c ../Rarewares-24bit.flac	2.414 ± 0.042	2.356	2.476	1.99 ± 0.04
./mulbits -5 -j2 -c ../Rarewares-24bit.flac	2.637 ± 0.036	2.574	2.685	2.17 ± 0.04
./current -5 -j2 -c ../Rarewares-24bit.flac	2.851 ± 0.055	2.766	2.921	2.35 ± 0.05
./betterbps -5p -j2 -c ../Rarewares-24bit.flac	4.289 ± 0.059	4.188	4.388	3.53 ± 0.06
./mulbits -5p -j2 -c ../Rarewares-24bit.flac	6.038 ± 0.114	5.936	6.308	4.97 ± 0.11
./current -5p -j2 -c ../Rarewares-24bit.flac	8.807 ± 0.098	8.678	8.992	7.25 ± 0.12
./betterbps -8 -j2 -c ../Rarewares-24bit.flac	10.126 ± 0.043	10.051	10.170	8.34 ± 0.10
./mulbits -8 -j2 -c ../Rarewares-24bit.flac	10.556 ± 0.076	10.481	10.718	8.69 ± 0.12
./current -8 -j2 -c ../Rarewares-24bit.flac	10.654 ± 0.044	10.623	10.762	8.77 ± 0.11
./betterbps -8p -j2 -c ../Rarewares-24bit.flac	66.274 ± 0.240	65.983	66.583	54.58 ± 0.66
./mulbits -8p -j2 -c ../Rarewares-24bit.flac	74.999 ± 0.077	74.884	75.150	61.76 ± 0.72
./current -8p -j2 -c ../Rarewares-24bit.flac	81.717 ± 0.122	81.525	81.929	67.30 ± 0.79

[Quake4]

Pls, fix max value by bits count to:
FLAC__uint64 max_abs_sample_value = (((FLAC__uint64)1) << subframe_bps) - 1;
Without types: (1 << subframe_bps) - 1