[wrt][XWALK-890]Update tcs for three icon check purpose

ivi crosswalk-8.36.164:
install the manifest_icon_three_tests.xpk
check applications.db find the three icon value in db record.
[wrt]update 1 tcs for wrt-rtcore-tizen-test

Can not check launch icon in ivi,no test this testcase
Merge pull request #391 from linshen/add1tcs-wrt-rtcore-tizen-tests

[wrt][XWALK-890]Update tcs for three icon check purpose