Palette+ext-intra bugfix: Read Intra angle info before palette info.
Palette+ext-intra bugfix: Read Intra angle info before palette info.

Note: Bug was only in aomedia codebase. webm/nextgenv2 branch is
correct.

Change-Id: Ie273a7286e3e1e6812f2a3570836eed4181dc4d7

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