avcodec/proresenc_kostya: do not write into alpha reserved bitfields
This byte represents 4 reserved bits followed by 4 alpha_channel_type bits. alpha_channel_type currently has 3 differents defined values: 0 (no alpha), 1 (8b alpha), and 2 (16b alpha), all the other values are reserved. This part is correctly written (alpha_bits>>3 does the correct thing), but the 4 initial bits are reserved.
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