[API] Add Restricted Field to User (#14630)

* Expose Restricted field for User

* Add Option to Change Restricted on User via adminEditUser API

* Add test who change restricted & test if it changed it ...

* make generate-swagger

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

routers/api/v1/admin/user.go

@@ -224,6 +224,9 @@ func EditUser(ctx *context.APIContext) {
 	if form.ProhibitLogin != nil {
 		u.ProhibitLogin = *form.ProhibitLogin
 	}
+	if form.Restricted != nil {
+		u.IsRestricted = *form.Restricted
+	}
 
 	if err := models.UpdateUser(u); err != nil {
 		if models.IsErrEmailAlreadyUsed(err) || models.IsErrEmailInvalid(err) {