[STATS_CHANGED] Correct intra tx size cdf update and counting
[STATS_CHANGED] Correct intra tx size cdf update and counting

It was in the wrong place, therefore the cdf is not updated properly
and the stats collected were all zero.

STATS_CHANGED

Change-Id: I0ad5757b3b3763e8c02e5cce6fb9342f5090dd86

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