[webapi] Refine Vibration tests keeping same with w3c

- web-platform-tests vibration tests have changed , refine webapi vibration cases for keeping same.

Impacted TCs num(approved): New 0, Update 9, Delete 0
Unit test Platform: Tizen M0
Tizen test result summary: Pass 9, Fail 0, Blocked 0
Merge pull request #375 from xinliux/xinliux/vibration-timeout

[webapi] Refine Vibration tests keeping same with w3c