[usecase-webapi] Improve Video usecase

- Remove "For Tizen" in test purpose
- Remove "For Android" in tests purpose
- Add DisablePassButton

Impacted TCs num(designed): New 0, Update 2, Delete 0
Unit test Platform: Tizen M0,Tizen IVI
Tizen test result summary: Pass 2, Fail 0, Blocked 0
Merge pull request #564 from xinliux/xinliux/usecase/video-improve

[usecase-webapi] Improve Video usecase