Fixes missing icons on home screen

Previous code didn't made allowance for appicon.png to be @
/app_data/appname/"platform"/appicon.js 

but did not account for app.js having a similar path. Not sure why this worked in an old version, but not in the latest.

App JS is @

var app_js = Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory + "/" + file_name + "/" + platform, 'app.js');
        
not

var app_js = Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory + "/" + file_name, 'app.js');