Remove redundant loop in ctx_reset
Remove redundant loop in ctx_reset

Merges two consecutive loops that iterated over TX_SIZES. There's no
impact to the bitstream. The 4 used as the termination threshold in the
second loop is equivalent to TX_SIZES.

Change-Id: Ic891d209b28f20907d53bcdd58139fe39c37b0fa

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