Harmonize missed reorderbuffer parameter names.
The function ReorderBufferCommitChild() was overlooked by initial work
from commit
035ce1fe.
Author: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/CAH2-WzkhzFESnRo+VaGqyEZuzc33Dw09BdZBVmW896Sa22ci_A@mail.gmail.com