common/prque: remove unreachable offset==blockSize branch in Push #32574
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The else-if branch checking s.offset == blockSize in Push was never reachable.
At the start of each Push, offset is effectively size % blockSize, so it cannot equal blockSize. Block rollover is already handled when size == capacity, wherea new block is allocated and offset is reset to 0. Removing the dead branch simplifies the logic and reduces code noise without changing behavior.