[usecase-webapi] Improve NFC demo express

- Failure analysis: Tizen platform does't not support tag.writeNDEF

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [Android]
Unit test result summary: pass 0, fail 1, block 0
Merge pull request #20 from zhuyongyong/yongzhu/usecase-webapi/nfc

[usecase-webapi][XWALK-2509] Improve NFC demo express