[Upgrade] DL Summon new setting config for Summoning PKers (Season 6)

Problem: DL can summon any party member (if level is reached) to anywhere at any time, which is not good !
Description: Because some players know this and abuse this system daily...they create DL, to summon their own Main characters, goes to Kill/clear all maps and then simply with "Phonoman " status gets summoned back, while other players play fair/play with only 1 char and do not have extra DL char just for summoning them. This is just to prevent PK from being destroyed fast and protected for PK'ers. If server admin want to keep as it is, he cant turn off this setting, but I think most of admins will turn on this setting for sure. (orange = 1 lvl stage, maybe even 2lvl stage could still be summoned, but 3lvl killer which is Phonoman, should not be allowed 100%)

Solution: Add new config in server-side, to turn off/on DLSummonKillers = 1/0