remove allow_return_item_amount_editing
remove allow_return_item_amount_editing

No longer used anywhere in the application

Fixes #5912

tancnle/spree,DynamoMTL/spree,thogg4/spree,reinaris/spree,reinaris/spree,APohio/spree,firman/spree,imella/spree,gautamsawhney/spree,APohio/spree,JuandGirald/spree,agient/agientstorefront,edgward/spree,azclick/spree,dandanwei/spree,jaspreet21anand/spree,derekluo/spree,hifly/spree,welitonfreitas/spree,kewaunited/spree,reinaris/spree,abhishekjain16/spree,ramkumar-kr/spree,adaddeo/spree,reidblomquist/spree,Engeltj/spree,carlesjove/spree,calvinl/spree,softr8/spree,groundctrl/spree,derekluo/spree,archSeer/spree,DarkoP/spree,rakibulislam/spree,Lostmyname/spree,patdec/spree,piousbox/spree,tesserakt/clean_spree,odk211/spree,lyzxsc/spree,keatonrow/spree,AgilTec/spree,azranel/spree,zamiang/spree,CiscoCloud/spree,Machpowersystems/spree_mach,thogg4/spree,archSeer/spree,fahidnasir/spree,jparr/spree,carlesjove/spree,vinayvinsol/spree,jasonfb/spree,useiichi/spree,rbngzlv/spree,TrialGuides/spree,TrialGuides/spree,azclick/spree,trigrass2/spree,tesserakt/clean_spree,assembledbrands/spree,progsri/spree,zaeznet/spree,sfcgeorge/spree,grzlus/spree,Hawaiideveloper/shoppingcart,madetech/spree,Hawaiideveloper/shoppingcart,abhishekjain16/spree,firman/spree,ahmetabdi/spree,yushine/spree,Boomkat/spree,joanblake/spree,rakibulislam/spree,SadTreeFriends/spree,builtbybuffalo/spree,imella/spree,jparr/spree,rajeevriitm/spree,pulkit21/spree,derekluo/spree,beni55/spree,vcavallo/spree,abhishekjain16/spree,TimurTarasenko/spree,volpejoaquin/spree,maybii/spree,hifly/spree,gautamsawhney/spree,brchristian/spree,ayb/spree,carlesjove/spree,pervino/spree,dafontaine/spree,rbngzlv/spree,alejandromangione/spree,priyank-gupta/spree,madetech/spree,useiichi/spree,hoanghiep90/spree,azclick/spree,delphsoft/spree-store-ballchair,vulk/spree,TimurTarasenko/spree,Boomkat/spree,nooysters/spree,CiscoCloud/spree,JuandGirald/spree,sunny2601/spree,priyank-gupta/spree,alvinjean/spree,assembledbrands/spree,jeffboulet/spree,softr8/spree,alvinjean/spree,dandanwei/spree,gautamsawhney/spree,sunny2601/spree,zaeznet/spree,Kagetsuki/spree,njerrywerry/spree,trigrass2/spree,hifly/spree,omarsar/spree,rajeevriitm/spree,hoanghiep90/spree,radarseesradar/spree,welitonfreitas/spree,sideci-sample/sideci-sample-spree,useiichi/spree,rakibulislam/spree,calvinl/spree,robodisco/spree,TimurTarasenko/spree,delphsoft/spree-store-ballchair,lsirivong/spree,archSeer/spree,NerdsvilleCEO/spree,reidblomquist/spree,yiqing95/spree,jaspreet21anand/spree,sideci-sample/sideci-sample-spree,TimurTarasenko/spree,azranel/spree,locomotivapro/spree,Boomkat/spree,AgilTec/spree,piousbox/spree,Machpowersystems/spree_mach,CJMrozek/spree,nooysters/spree,alejandromangione/spree,berkes/spree,berkes/spree,lyzxsc/spree,jeffboulet/spree,berkes/spree,JDutil/spree,Lostmyname/spree,ramkumar-kr/spree,thogg4/spree,grzlus/spree,carlesjove/spree,zaeznet/spree,rajeevriitm/spree,jasonfb/spree,keatonrow/spree,jspizziri/spree,tomash/spree,sunny2601/spree,odk211/spree,DynamoMTL/spree,vinsol/spree,jaspreet21anand/spree,robodisco/spree,radarseesradar/spree,raow/spree,Machpowersystems/spree_mach,abhishekjain16/spree,dandanwei/spree,shaywood2/spree,brchristian/spree,jeffboulet/spree,ahmetabdi/spree,JuandGirald/spree,omarsar/spree,hoanghiep90/spree,locomotivapro/spree,builtbybuffalo/spree,Engeltj/spree,JDutil/spree,progsri/spree,shaywood2/spree,ahmetabdi/spree,DarkoP/spree,NerdsvilleCEO/spree,imella/spree,mindvolt/spree,grzlus/spree,SadTreeFriends/spree,vulk/spree,njerrywerry/spree,groundctrl/spree,gregoryrikson/spree-sample,gregoryrikson/spree-sample,azranel/spree,ramkumar-kr/spree,priyank-gupta/spree,AgilTec/spree,alejandromangione/spree,adaddeo/spree,tomash/spree,welitonfreitas/spree,vcavallo/spree,patdec/spree,Lostmyname/spree,JDutil/spree,pulkit21/spree,delphsoft/spree-store-ballchair,nooysters/spree,vinsol/spree,shekibobo/spree,adaddeo/spree,FadliKun/spree,radarseesradar/spree,ahmetabdi/spree,beni55/spree,TrialGuides/spree,lsirivong/spree,volpejoaquin/spree,miyazawatomoka/spree,maybii/spree,robodisco/spree,karlitxo/spree,sliaquat/spree,zamiang/spree,beni55/spree,maybii/spree,shaywood2/spree,hoanghiep90/spree,rajeevriitm/spree,DynamoMTL/spree,JuandGirald/spree,jimblesm/spree,piousbox/spree,builtbybuffalo/spree,Kagetsuki/spree,lyzxsc/spree,siddharth28/spree,tancnle/spree,patdec/spree,yiqing95/spree,karlitxo/spree,jparr/spree,Lostmyname/spree,FadliKun/spree,groundctrl/spree,agient/agientstorefront,dafontaine/spree,beni55/spree,moneyspyder/spree,raow/spree,welitonfreitas/spree,quentinuys/spree,vinsol/spree,Ropeney/spree,CiscoCloud/spree,sliaquat/spree,jasonfb/spree,keatonrow/spree,jparr/spree,orenf/spree,camelmasa/spree,yushine/spree,mleglise/spree,raow/spree,edgward/spree,camelmasa/spree,DarkoP/spree,rakibulislam/spree,mindvolt/spree,dandanwei/spree,quentinuys/spree,moneyspyder/spree,FadliKun/spree,piousbox/spree,yushine/spree,reidblomquist/spree,wolfieorama/spree,ayb/spree,sfcgeorge/spree,adaddeo/spree,cutefrank/spree,KMikhaylovCTG/spree,NerdsvilleCEO/spree,radarseesradar/spree,nooysters/spree,lsirivong/spree,jasonfb/spree,trigrass2/spree,JDutil/spree,jimblesm/spree,tesserakt/clean_spree,firman/spree,omarsar/spree,alejandromangione/spree,zaeznet/spree,Kagetsuki/spree,reidblomquist/spree,yiqing95/spree,vmatekole/spree,azranel/spree,sfcgeorge/spree,miyazawatomoka/spree,jspizziri/spree,siddharth28/spree,fahidnasir/spree,omarsar/spree,brchristian/spree,Ropeney/spree,zamiang/spree,caiqinghua/spree,azclick/spree,sfcgeorge/spree,rbngzlv/spree,priyank-gupta/spree,vulk/spree,maybii/spree,jeffboulet/spree,APohio/spree,FadliKun/spree,ramkumar-kr/spree,trigrass2/spree,siddharth28/spree,cutefrank/spree,moneyspyder/spree,thogg4/spree,gautamsawhney/spree,madetech/spree,orenf/spree,vcavallo/spree,caiqinghua/spree,jspizziri/spree,mindvolt/spree,vmatekole/spree,AgilTec/spree,wolfieorama/spree,dafontaine/spree,pervino/spree,edgward/spree,cutefrank/spree,gregoryrikson/spree-sample,grzlus/spree,KMikhaylovCTG/spree,kewaunited/spree,dafontaine/spree,orenf/spree,calvinl/spree,calvinl/spree,odk211/spree,fahidnasir/spree,CiscoCloud/spree,kewaunited/spree,Boomkat/spree,locomotivapro/spree,joanblake/spree,Hawaiideveloper/shoppingcart,moneyspyder/spree,mindvolt/spree,vinayvinsol/spree,progsri/spree,kewaunited/spree,softr8/spree,mleglise/spree,jimblesm/spree,camelmasa/spree,shekibobo/spree,Engeltj/spree,joanblake/spree,shaywood2/spree,pervino/spree,DarkoP/spree,jimblesm/spree,APohio/spree,sliaquat/spree,odk211/spree,ayb/spree,karlitxo/spree,caiqinghua/spree,volpejoaquin/spree,firman/spree,Engeltj/spree,wolfieorama/spree,groundctrl/spree,orenf/spree,mleglise/spree,tancnle/spree,camelmasa/spree,berkes/spree,locomotivapro/spree,tancnle/spree,pervino/spree,gregoryrikson/spree-sample,vinayvinsol/spree,cutefrank/spree,yiqing95/spree,Kagetsuki/spree,vmatekole/spree,SadTreeFriends/spree,tomash/spree,ayb/spree,NerdsvilleCEO/spree,karlitxo/spree,CJMrozek/spree,tesserakt/clean_spree,delphsoft/spree-store-ballchair,builtbybuffalo/spree,pulkit21/spree,progsri/spree,joanblake/spree,jspizziri/spree,DynamoMTL/spree,softr8/spree,yushine/spree,CJMrozek/spree,edgward/spree,shekibobo/spree,assembledbrands/spree,alvinjean/spree,shekibobo/spree,sliaquat/spree,vulk/spree,alvinjean/spree,SadTreeFriends/spree,lsirivong/spree,raow/spree,robodisco/spree,quentinuys/spree,vinsol/spree,reinaris/spree,vinayvinsol/spree,vcavallo/spree,vmatekole/spree,njerrywerry/spree,useiichi/spree,madetech/spree,KMikhaylovCTG/spree,sunny2601/spree,keatonrow/spree,mleglise/spree,agient/agientstorefront,rbngzlv/spree,caiqinghua/spree,lyzxsc/spree,miyazawatomoka/spree,archSeer/spree,derekluo/spree,Ropeney/spree,Ropeney/spree,volpejoaquin/spree,KMikhaylovCTG/spree,siddharth28/spree,patdec/spree,quentinuys/spree,TrialGuides/spree,fahidnasir/spree,miyazawatomoka/spree,Hawaiideveloper/shoppingcart,tomash/spree,sideci-sample/sideci-sample-spree,zamiang/spree,njerrywerry/spree,CJMrozek/spree,wolfieorama/spree,hifly/spree,brchristian/spree,jaspreet21anand/spree,agient/agientstorefront,pulkit21/spree