btopt: minor refactor : removed one SET_PRICE() macro invocation
btopt: minor refactor : removed one SET_PRICE() macro invocation

direct assignment makes operation cleaner.
Also allows some (very minor) optimization (non-measurable)

Cyan4973/zstd,Cyan4973/zstd,Cyan4973/zstd,Cyan4973/zstd,Cyan4973/zstd