Fix filter 1 rounding in the BRR IIR filter - #18
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The S-DSP forms filter 1's 1/16 term by negating first and then shifting.
Reference: https://github.com/MiSTer-devel/SNES_MiSTer/blob/ef6aec399af9fec5f228244c16aadc6a63e7ea16/rtl/DSP.vhd#L665-L666 (or any emulator)
This is your proper fix for #13