Fix critical LUt memory bug #766
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When loading the LUT, memory was unnecessarily allocated to the entire 144MB LUT file instead of the selected 48MB sub-table. The fix reduces HyperHDR memory consumption by 96MB if a LUT was used (including YUV to RGB conversion also in SDR, HDR tone mapping in USB grabbers or flatbuffers/protobuffers when full 144MB file LUT table was used)