Make set_txfm_ctx aware of 4:1 transforms
Make set_txfm_ctx aware of 4:1 transforms

This change was missing before.

Change-Id: Ie8aecb8d51284b32a02d76f6f3de5f1c77a5f692

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