chore(package.json): fix path to angular-load.min.js.map in "update-index-async" command

This fixes the 404 not found when it tries to retrieve this map file and can't because
the path is wrong.

Note that you won't see that error if you have JavaScript source maps turned off.

Closes #197

Author: EC2 Default User

package.json

@@ -29,6 +29,6 @@
     "preprotractor": "npm run update-webdriver",
     "protractor": "protractor e2e-tests/protractor.conf.js",
 
-    "update-index-async": "node -e \"require('shelljs/global'); sed('-i', /\\/\\/@@NG_LOADER_START@@[\\s\\S]*\\/\\/@@NG_LOADER_END@@/, '//@@NG_LOADER_START@@\\n' + cat('app/bower_components/angular-loader/angular-loader.min.js') + '\\n//@@NG_LOADER_END@@', 'app/index-async.html');\""
+    "update-index-async": "node -e \"require('shelljs/global'); sed('-i', /\\/\\/@@NG_LOADER_START@@[\\s\\S]*\\/\\/@@NG_LOADER_END@@/, '//@@NG_LOADER_START@@\\n' + sed(/sourceMappingURL=angular-loader.min.js.map/,'sourceMappingURL=bower_components/angular-loader/angular-loader.min.js.map','app/bower_components/angular-loader/angular-loader.min.js') + '\\n//@@NG_LOADER_END@@', 'app/index-async.html');\""
   }
 }