Update index.js
Update index.js

Fixes error below when trying to gulp dev in app web.
ERROR in ./src/app/index.js
Module not found: Error: Cannot resolve module 'utils/isMobile' in actor-platform/actor-apps/app-web/src/app
 @ ./src/app/index.js 43:21-46
lzpfmh/actor-platform,yangchenghu/actor-platform,WangCrystal/actor-platform,zwensoft/actor-platform,EaglesoftZJ/actor-platform,EaglesoftZJ/actor-platform,damoguyan8844/actor-platform,zwensoft/actor-platform,zwensoft/actor-platform,EaglesoftZJ/actor-platform,damoguyan8844/actor-platform,gaolichuang/actor-platform,damoguyan8844/actor-platform,y0ke/actor-platform,liruqi/actor-platform-v0.9,hzy87email/actor-platform,yangchenghu/actor-platform,EaglesoftZJ/actor-platform,liruqi/actor-platform,zwensoft/actor-platform,EaglesoftZJ/actor-platform,gaolichuang/actor-platform,WangCrystal/actor-platform,amezcua/actor-platform,EaglesoftZJ/actor-platform,hzy87email/actor-platform,WangCrystal/actor-platform,EaglesoftZJ/actor-platform,amezcua/actor-platform,liruqi/actor-platform-v0.9,y0ke/actor-platform,hzy87email/actor-platform,jamesbond12/actor-platform,yangchenghu/actor-platform,zwensoft/actor-platform,amezcua/actor-platform,liruqi/actor-platform-v0.9,amezcua/actor-platform,liruqi/actor-platform,liruqi/actor-platform-v0.9,zwensoft/actor-platform,yangchenghu/actor-platform,damoguyan8844/actor-platform,lzpfmh/actor-platform,jamesbond12/actor-platform,jamesbond12/actor-platform,y0ke/actor-platform,gaolichuang/actor-platform,y0ke/actor-platform,y0ke/actor-platform,WangCrystal/actor-platform,damoguyan8844/actor-platform,y0ke/actor-platform,hzy87email/actor-platform,jamesbond12/actor-platform,gaolichuang/actor-platform,hzy87email/actor-platform,amezcua/actor-platform,yangchenghu/actor-platform,gaolichuang/actor-platform,lzpfmh/actor-platform,liruqi/actor-platform,liruqi/actor-platform,yangchenghu/actor-platform,WangCrystal/actor-platform,liruqi/actor-platform,gaolichuang/actor-platform,lzpfmh/actor-platform,y0ke/actor-platform,hzy87email/actor-platform,jamesbond12/actor-platform,lzpfmh/actor-platform,jamesbond12/actor-platform,y0ke/actor-platform,EaglesoftZJ/actor-platform,liruqi/actor-platform,liruqi/actor-platform-v0.9,amezcua/actor-platform,liruqi/actor-platform-v0.9,lzpfmh/actor-platform,WangCrystal/actor-platform,damoguyan8844/actor-platform