[ios] Change the default bridge mode to XHR_NO_PAYLOAD.
[ios] Change the default bridge mode to XHR_NO_PAYLOAD.

There is a report of XHR_WITH_PAYLOAD crashing, so disabling it for the
2.1.0 release.

https://issues.apache.org/jira/browse/CB-1404

the1sky/cordova-js,revolunet/cordova-js,apache/cordova-js,danrixd/cordova-js,andfaulkner/cordovajs-cms-one,revolunet/cordova-js,revolunet/cordova-js,yedeveloper/cordova-js,infil00p/cordova-js,the1sky/cordova-js,Adilmar/cordova-js,lvrookie/cordova-js,the1sky/cordova-js,Zekom/cordova-js,Adilmar/cordova-js,infil00p/cordova-js,gitterHQ/cordova-js,Zekom/cordova-js,corimf/cordova-js,yedeveloper/cordova-js,yedeveloper/cordova-js,Adilmar/cordova-js,lvrookie/cordova-js,andfaulkner/cordovajs-cms-one,lvrookie/cordova-js,Zekom/cordova-js,andfaulkner/cordovajs-cms-one,danrixd/cordova-js,gitterHQ/cordova-js,corimf/cordova-js,danrixd/cordova-js,corimf/cordova-js