Removed check for enqueuing a chunk that is already enqueued to be loaded
Removed check for enqueuing a chunk that is already enqueued to be loaded

This remaval is safe as cWorldStorage checks for duplicate chunks when dequeuing
and removes an expensive iteration whilst holding the queue lock

MuhammadWang/MCServer,mc-server/MCServer,thetaeo/cuberite,Altenius/cuberite,QUSpilPrgm/cuberite,birkett/cuberite,HelenaKitty/EbooMC,ionux/MCServer,zackp30/cuberite,mmdk95/cuberite,kevinr/cuberite,kevinr/cuberite,Howaner/MCServer,jammet/MCServer,mjssw/cuberite,johnsoch/cuberite,Tri125/MCServer,bendl/cuberite,nounoursheureux/MCServer,nicodinh/cuberite,QUSpilPrgm/cuberite,Frownigami1/cuberite,mc-server/MCServer,zackp30/cuberite,Haxi52/cuberite,birkett/MCServer,birkett/cuberite,HelenaKitty/EbooMC,johnsoch/cuberite,guijun/MCServer,Howaner/MCServer,linnemannr/MCServer,marvinkopf/cuberite,birkett/cuberite,Haxi52/cuberite,mmdk95/cuberite,johnsoch/cuberite,zackp30/cuberite,linnemannr/MCServer,kevinr/cuberite,tonibm19/cuberite,mjssw/cuberite,nounoursheureux/MCServer,mjssw/cuberite,mmdk95/cuberite,nevercast/cuberite,Altenius/cuberite,Tri125/MCServer,Schwertspize/cuberite,mjssw/cuberite,Schwertspize/cuberite,guijun/MCServer,SamOatesPlugins/cuberite,Altenius/cuberite,guijun/MCServer,Altenius/cuberite,linnemannr/MCServer,Howaner/MCServer,QUSpilPrgm/cuberite,electromatter/cuberite,MuhammadWang/MCServer,birkett/MCServer,HelenaKitty/EbooMC,Fighter19/cuberite,zackp30/cuberite,marvinkopf/cuberite,nichwall/cuberite,birkett/MCServer,tonibm19/cuberite,Haxi52/cuberite,Fighter19/cuberite,ionux/MCServer,Frownigami1/cuberite,mc-server/MCServer,Frownigami1/cuberite,mc-server/MCServer,Fighter19/cuberite,linnemannr/MCServer,Schwertspize/cuberite,Fighter19/cuberite,electromatter/cuberite,mc-server/MCServer,nounoursheureux/MCServer,linnemannr/MCServer,guijun/MCServer,birkett/MCServer,johnsoch/cuberite,tonibm19/cuberite,mmdk95/cuberite,SamOatesPlugins/cuberite,birkett/cuberite,thetaeo/cuberite,Schwertspize/cuberite,Altenius/cuberite,bendl/cuberite,birkett/cuberite,tonibm19/cuberite,johnsoch/cuberite,nounoursheureux/MCServer,HelenaKitty/EbooMC,Frownigami1/cuberite,thetaeo/cuberite,ionux/MCServer,Haxi52/cuberite,mjssw/cuberite,kevinr/cuberite,electromatter/cuberite,marvinkopf/cuberite,nichwall/cuberite,jammet/MCServer,Howaner/MCServer,guijun/MCServer,nevercast/cuberite,birkett/MCServer,Haxi52/cuberite,Fighter19/cuberite,zackp30/cuberite,Tri125/MCServer,SamOatesPlugins/cuberite,nounoursheureux/MCServer,zackp30/cuberite,Schwertspize/cuberite,ionux/MCServer,thetaeo/cuberite,bendl/cuberite,guijun/MCServer,Tri125/MCServer,nevercast/cuberite,electromatter/cuberite,Tri125/MCServer,mjssw/cuberite,tonibm19/cuberite,thetaeo/cuberite,nounoursheureux/MCServer,MuhammadWang/MCServer,jammet/MCServer,marvinkopf/cuberite,birkett/MCServer,nevercast/cuberite,ionux/MCServer,marvinkopf/cuberite,Howaner/MCServer,nicodinh/cuberite,nichwall/cuberite,bendl/cuberite,SamOatesPlugins/cuberite,ionux/MCServer,nicodinh/cuberite,HelenaKitty/EbooMC,nicodinh/cuberite,jammet/MCServer,mmdk95/cuberite,nevercast/cuberite,tonibm19/cuberite,nichwall/cuberite,thetaeo/cuberite,QUSpilPrgm/cuberite,QUSpilPrgm/cuberite,bendl/cuberite,electromatter/cuberite,nevercast/cuberite,kevinr/cuberite,birkett/cuberite,marvinkopf/cuberite,MuhammadWang/MCServer,mc-server/MCServer,nichwall/cuberite,Haxi52/cuberite,QUSpilPrgm/cuberite,nicodinh/cuberite,linnemannr/MCServer,Frownigami1/cuberite,nicodinh/cuberite,MuhammadWang/MCServer,Howaner/MCServer,nichwall/cuberite,jammet/MCServer,Tri125/MCServer,jammet/MCServer,kevinr/cuberite,mmdk95/cuberite,electromatter/cuberite,SamOatesPlugins/cuberite,Fighter19/cuberite