(cordova): fix invalid cordova hook interface use, fix #908

Author: Sergey Vohmyanin

scripts/lib/utilities.js

@@ -66,7 +66,7 @@ Utilities.writeJsonToXmlFile = function(jsonObj, filepath, parseOpts){
  * The xcodeCordovaProj directory path is defined in the locations property of the Cordova-iOS platform's API.
  */
 Utilities.getAppName = function(){
-    if(_context.opts.platforms.indexOf('ios') !== -1){
+    if(_context.opts.cordova.platforms.indexOf('ios') !== -1){
         const projectRoot = _context.opts.projectRoot;
         const platformPath = path.join(projectRoot, 'platforms', 'ios');
         const cordova_ios = require('cordova-ios');