Fix notifying duplicate notifications
Fix notifying duplicate notifications

if the app implements new background delegate call
but background mode is not enabled, it will still
do the new life cycle

ipmobiletech/ios-library,mikerowan/ios-library,ipmobiletech/ios-library,mikerowan/ios-library,zhangqinghe/ios-library,grosch/ios-library,grosch/ios-library,ipmobiletech/ios-library,mikerowan/ios-library,grosch/ios-library,manuyavuz/ios-library,zhangqinghe/ios-library,manuyavuz/ios-library,manuyavuz/ios-library,zhangqinghe/ios-library