Little Snitch uninstalled properly but Little Snitch Helper still here
Little Snitch Helper is installed in /Library/Little Snitch/Little Snitch Helper.app. But I assume that it properly deinstalled, the only thing remaining is the entry you are looking at which was required to give the application access to location data. 

I just tried with some other "old" entries, you should be able to remove it by just unticking the entry (if it already is unticked, tick it first and then untick it again).