StdRS Unnecessary Sample Division by 10

[aeoranday]

In the standard running sum AVX2 implementation, there is a division by 10 on the sample data that does not get reset.

fdreadoutlibs/include/fdreadoutlibs/wibeth/tpg/ProcessStandardRSAVX2.hpp

Lines 137 to 144 in 1ec993b

	__m256i first_part = _mm256_mullo_epi16(RS, R_factor);
	//__m256i first_part_div = _mm256_div_epi16(RS, 10);
	//__m256i second_part = s;
	//__m256i second_part_div = _mm256_div_epi16(_mm256_abs_epi16(s), 10);
	//RS = _mm256_div_epi16(_mm256_add_epi16(first_part, second_part), 10);
	RS = swtpg_wibeth::_mm256_div_epi16(_mm256_add_epi16(first_part, s), 10);

This further affects the sum and requires an unexpected, low threshold.

This division is necessary for the running sum R factor, so this can be resolved by only dividing by 10 on that part.