rdopt: fix wrong #endif
rdopt: fix wrong #endif

The comment after the affected #endif was incorrect. This patch updates
it so that it reflects the condition that it ends.

Change-Id: Ib5c39a9444e72b2582301d9e4b03d3c56f9cf304

GrokImageCompression/aom,smarter/aom,smarter/aom,smarter/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,luctrudeau/aom,smarter/aom,luctrudeau/aom,smarter/aom,luctrudeau/aom,luctrudeau/aom,GrokImageCompression/aom,luctrudeau/aom,luctrudeau/aom,GrokImageCompression/aom,GrokImageCompression/aom