Fix a enc/dec mismatch under CONFIG_MISC_FIXES

The culprit is on the decode side xd->lossless[i] setup was in wrong
location where segment features are not yet decoded.

Also on the encoder side, transform mode was not set consistently
between when tx_mode is selected and how tx_mode is enforced in
tx size selection.

Change-Id: I4c4c32188fda7530cadab9b46d4201f33f7ceca3
3 files changed