Fix a bug in loop restoration switchable search
Fix a bug in loop restoration switchable search

This bug (introduced in 8af64ae) effectively turned off switchable search causing a
drop in coding efficiency.

Change-Id: I6db0cf48371638673fcf951158eef32a6db42545

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