Added _streamEndWasReached = false back in.
Added _streamEndWasReached = false back in.

I don't know why it was removed, though it seemed to have no ill effects.

zzzhan/LZMA-JS,addaleax/LZMA-JS,addaleax/LZMA-JS,zzzhan/LZMA-JS,nmrugg/LZMA-JS,nmrugg/LZMA-JS,zzzhan/LZMA-JS,nmrugg/LZMA-JS,addaleax/LZMA-JS