[webapi][XWALK-2240] Fix bug for mediaRenderer

- Modify the id property of application element
- Failure analysis: MediaRenderer does not support

Impacted tests(approved): new 0, update 0, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 0, fail 4, block 40
Merge pull request #638 from yunxliu/yunxliu/misc/mediaRenderer_update

[webapi][XWALK-2240] Fix bug for mediaRenderer