Minor delta-net tweak

[ikawrakow]

Worth ~1% better TG on CUDA and CPU-only.

[magikRUKKOLA]

Whoa!

IQ2_KL Qwen3.5 397B; 8x3090:

PP	TG	N_KV	T_PP s	S_PP t/s	T_TG s	S_TG t/s
4096	1024	0	3.762	1088.69	26.000	39.38
4096	1024	4096	3.887	1053.72	26.060	39.29
4096	1024	8192	4.017	1019.60	26.525	38.60
4096	1024	12288	4.144	988.36	27.040	37.87
4096	1024	16384	4.274	958.27	27.461	37.29
4096	1024	20480	4.401	930.60	27.973	36.61
4096	1024	24576	4.534	903.31	28.108	36.43
4096	1024	28672	4.666	877.90	28.524	35.90
4096	1024	32768	4.793	854.59	29.253	35.00
4096	1024	36864	4.918	832.81	29.230	35.03
4096	1024	40960	5.041	812.57	29.671	34.51
4096	1024	45056	5.165	793.01	30.189	33.92
4096	1024	49152	5.302	772.52	30.575	33.49
4096	1024	53248	5.428	754.63	30.868	33.17
4096	1024	57344	5.549	738.22	31.350	32.66
4096	1024	61440	5.694	719.41	31.510	32.50
4096	1024	65536	5.803	705.79	31.931	32.07
4096	1024	69632	5.926	691.19	32.492	31.52
4096	1024	73728	6.059	676.02	32.775	31.24
4096	1024	77824	6.189	661.86	32.997	31.03
4096	1024	81920	6.313	648.86	33.296	30.75
4096	1024	86016	6.455	634.50	33.817	30.28
4096	1024	90112	6.573	623.19	34.101	30.03
4096	1024	94208	6.690	612.23	34.378	29.79
4096	1024	98304	6.828	599.92	34.939	29.31
4096	1024	102400	6.955	588.94	35.140	29.14
4096	1024	106496	7.085	578.13	35.639	28.73
4096	1024	110592	7.218	567.46	35.946	28.49
4096	1024	114688	7.334	558.53	36.429	28.11
4096	1024	118784	7.461	548.96	36.542	28.02
4096	1024	122880	7.601	538.87	37.010	27.67
4096	1024	126976	7.766	527.42	37.403	27.38
4096	1024	131072	7.865	520.80	37.735	27.14

references:

#1320 (comment)