[wrt] update icon size from 117 to 128

[Detailed commit message (if have)]
Impacted TCs num(approved): New 0, update 0, deleted 0
Unit test platform: [tizen]
Unit test result summary:
 wrt-manifest-tizen-test:Pass 248, Fail 0, Blocked 0
 packagemgt/digitatlsign:pack to xpk install/uninstall/launch pass
Merge pull request #760 from linshen/shen/wrt/mainifest-117-128

[wrt] update icon size from 117 to 128