[webapi]Modify tests.xml to delete a duplicated case ID

Impacted tests(approved):new 0,update 19,delete 0
Unit test platform:[Android]
Unit test result summary:pass 11,fail 8,block 0
Merge pull request #1004 from chenxix/chenxi/misc-uiautomation/modify-colors

[webapi]Modify tests.xml to delete a duplicated case ID