[usecase-wrt]remove check xwalkctl install usecase

Impacted TCs num(approved): New 0, update 1, deleted 0
Unit test platform: [tizen]
Test Result: Pass 1, Fail 0
Merge pull request #1025 from linshen/shenin/remove-usecase-xwalkctl-check

[usecase-wrt]remove check xwalkctl install usecase