Use speed 2 on superframe test.
Use speed 2 on superframe test.

No need to do avoid shortcuts when all we are testing is the superframe
syntax. Decreases the run time up the VP10 version of the test from 22
seconds to 3 seconds on my machine.

Change-Id: If0c3551cbb8af8b803e02629e803e5f09da76cd1

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