Revert "Add Debian package registry" (#24412)

Reverts go-gitea/gitea#22854

models/user/setting.go

@@ -11,7 +11,6 @@ import (
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/modules/cache"
 	setting_module "code.gitea.io/gitea/modules/setting"
-	"code.gitea.io/gitea/modules/util"
 
 	"xorm.io/builder"
 )
@@ -43,10 +42,6 @@ func (err ErrUserSettingIsNotExist) Error() string {
 	return fmt.Sprintf("Setting[%s] is not exist", err.Key)
 }
 
-func (err ErrUserSettingIsNotExist) Unwrap() error {
-	return util.ErrNotExist
-}
-
 // IsErrUserSettingIsNotExist return true if err is ErrSettingIsNotExist
 func IsErrUserSettingIsNotExist(err error) bool {
 	_, ok := err.(ErrUserSettingIsNotExist)