Disable adapt_scan by default
Disable adapt_scan by default

This experiment still requires review from AOMedia due to
conflicts with other adopted experiments.

Change-Id: I22c7ae3fd0aac7f537cabc6fc63218fb97851a7a

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