[Sample] Fix a typo s/Sleleton/Skeleton/
[Sample] Fix a typo s/Sleleton/Skeleton/

BUG=https://crosswalk-project.org/jira/browse/CTS-600

halton/realsense-extensions-crosswalk,halton/realsense-extensions-crosswalk,jondong/realsense-extensions-crosswalk,jondong/realsense-extensions-crosswalk,halton/realsense-extensions-crosswalk,crosswalk-project/realsense-extensions-crosswalk,jondong/realsense-extensions-crosswalk,halton/realsense-extensions-crosswalk,crosswalk-project/realsense-extensions-crosswalk,jondong/realsense-extensions-crosswalk,crosswalk-project/realsense-extensions-crosswalk,crosswalk-project/realsense-extensions-crosswalk