Fix bug in mono-buffer.fun introduced by 8d5681c #36
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The intention of 8d5681c was to double the buffer size when
ensureCapacitymust grow the buffer, but mistakenly doubled the buffer size every timeensureCapacitywas called, leading to an uncaughtOverflowexception after sufficient operations that callensureCapacitybefore adding content to the buffer.See MLton/mlton#608.