[webapi] Update open_app to app_launcher

Impacted tests(approved): new 0, update 0, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 74, fail 0, block 0
Merge pull request #1241 from yunxliu/yunxliu/webapi/modifyScript_case

[webapi] Update open_app to app_launcher