[webapi][XWALK-1291] Update tests to fix issue

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [IVI]
Unit test result summary: pass 1, fail 0, block 0
Merge pull request #1122 from kangxu/kangxu/webapi/tct-filesystem-tizen-tests/updateCases

[webapi][XWALK-1291] Update tests due to change test point