fix(userlist): make search case-insensitive
fix(userlist): make search case-insensitive

needed for user mentions,  and other user list searches

SD-750

petrjasek/superdesk,thnkloud9/superdesk,sjunaid/superdesk,hlmnrmr/superdesk,superdesk/superdesk-ntb,vied12/superdesk,ancafarcas/superdesk,verifiedpixel/superdesk,darconny/superdesk,marwoodandrew/superdesk-aap,plamut/superdesk,amagdas/superdesk,fritzSF/superdesk,marwoodandrew/superdesk,verifiedpixel/superdesk,pavlovicnemanja92/superdesk,liveblog/superdesk,gbbr/superdesk,hlmnrmr/superdesk,akintolga/superdesk-aap,superdesk/superdesk,petrjasek/superdesk-ntb,plamut/superdesk,fritzSF/superdesk,ioanpocol/superdesk,amagdas/superdesk,superdesk/superdesk-aap,vied12/superdesk,mdhaman/superdesk,superdesk/superdesk,sivakuna-aap/superdesk,thnkloud9/superdesk,ioanpocol/superdesk-ntb,superdesk/superdesk-ntb,superdesk/superdesk-aap,akintolga/superdesk-aap,akintolga/superdesk,superdesk/superdesk-ntb,amagdas/superdesk,verifiedpixel/superdesk,mugurrus/superdesk,liveblog/superdesk,petrjasek/superdesk-ntb,pavlovicnemanja/superdesk,amagdas/superdesk,liveblog/superdesk,akintolga/superdesk-aap,liveblog/superdesk,ancafarcas/superdesk,ioanpocol/superdesk-ntb,sjunaid/superdesk,petrjasek/superdesk,akintolga/superdesk,marwoodandrew/superdesk,verifiedpixel/superdesk,marwoodandrew/superdesk-aap,akintolga/superdesk,superdesk/superdesk,liveblog/superdesk,superdesk/superdesk-ntb,mdhaman/superdesk,fritzSF/superdesk,marwoodandrew/superdesk-aap,ioanpocol/superdesk-ntb,fritzSF/superdesk,Aca-jov/superdesk,mdhaman/superdesk,plamut/superdesk,pavlovicnemanja/superdesk,vied12/superdesk,vied12/superdesk,mdhaman/superdesk-aap,petrjasek/superdesk,fritzSF/superdesk,superdesk/superdesk,petrjasek/superdesk,pavlovicnemanja92/superdesk,darconny/superdesk,mugurrus/superdesk,mdhaman/superdesk-aap,ioanpocol/superdesk,mugurrus/superdesk,marwoodandrew/superdesk,vied12/superdesk,pavlovicnemanja92/superdesk,pavlovicnemanja/superdesk,verifiedpixel/superdesk,marwoodandrew/superdesk,pavlovicnemanja92/superdesk,hlmnrmr/superdesk,gbbr/superdesk,amagdas/superdesk,gbbr/superdesk,marwoodandrew/superdesk,pavlovicnemanja92/superdesk,petrjasek/superdesk-ntb,darconny/superdesk,marwoodandrew/superdesk-aap,akintolga/superdesk,akintolga/superdesk-aap,superdesk/superdesk-aap,thnkloud9/superdesk,mdhaman/superdesk-aap,akintolga/superdesk,ioanpocol/superdesk,sjunaid/superdesk,Aca-jov/superdesk,sivakuna-aap/superdesk,Aca-jov/superdesk,sivakuna-aap/superdesk,mdhaman/superdesk-aap,plamut/superdesk,sivakuna-aap/superdesk,superdesk/superdesk-aap,sivakuna-aap/superdesk,plamut/superdesk,petrjasek/superdesk-ntb,pavlovicnemanja/superdesk,ancafarcas/superdesk