Fix XWALK-2060 update xwalk url to xwalk-launcher url

[Detailed commit message (if have)]
Impacted TCs num(approved): New 0, update 6, deleted 0
Unit test platform: [tizen]
Unit test result summary: Fail 6, xwalk-launcher error

tizen-extensions-crosswalk-0.79-0.i686
crosswalk-8.36.169.0-0.i686
xwalk-launcher "http://www.baidu.com"

Couldn't call 'Launch' method: GDBus.Error:org.crosswalkproject.
Running.Manager.Error: Error launching application with id http://www.baidu.com
Merge pull request #415 from linshen/update-xwalk-url

[wrt][XWALK-2060]Fix XWALK-2060 update xwalk url to xwalk-launcher url