Remove `id` from hidden field, closes #112
Remove `id` from hidden field, closes #112

Otherwise it’ll have the same id as the file field and ids should be unique.
grosser/refile,abitdodgy/refile,monkbroc/refile,jabbawookiees/refile,toothfairy/refile,costis/refile,ChanChar/refile,manfe/refile,TimLang/refile,Axxiss/refile,JasOXIII/refile,callmeed/refile,ChanChar/refile,ninjapanzer/refile,JasOXIII/refile,superacidjax/refile,darkleaf/refile,div/refile,monkbroc/refile,Eric-Guo/refile,callmeed/refile,acrogenesis-lab/refile,grosser/refile,div/refile,acrogenesis-lab/refile,carl/refile,ninjapanzer/refile,abitdodgy/refile,fabn/refile,ninjapanzer/refile,manfe/refile,Axxiss/refile,y-yagi/refile,refile/refile,fabn/refile,costis/refile,TimLang/refile,JasOXIII/refile,manfe/refile,y-yagi/refile,grosser/refile,costis/refile,Eric-Guo/refile,carl/refile,carl/refile,jabbawookiees/refile,jabbawookiees/refile,darkleaf/refile,acrogenesis-lab/refile,darkleaf/refile,abitdodgy/refile,refile/refile,superacidjax/refile,fabn/refile,ChanChar/refile,toothfairy/refile,TimLang/refile,toothfairy/refile,monkbroc/refile,superacidjax/refile,div/refile,Eric-Guo/refile,callmeed/refile,Axxiss/refile,refile/refile,y-yagi/refile