Reset x->skip flag in the ref-mv search loop
Reset x->skip flag in the ref-mv search loop

Resolve the unit test failure on
AV1/LosslessTestLarge.TestLossLessEncoding/0

Change-Id: Ica884da0d0e5bd808c9f02f5de0a29cab950e7be

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