Fix experiment inconsistency in obu.c.
Fix experiment inconsistency in obu.c.

Make the ordering of the obu_frame and obu_redundant_frame_header
experiment preprocessor guards consistent.

Change-Id: I9711540de4f33b9325f492d4e32dbd64a6dc4fd7

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom