Fix updating user visibility (#35036) (#35044)

Backport #35036 by @lunny

Fix #35030

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/api/v1/org/org.go

@@ -393,7 +393,7 @@ func Edit(ctx *context.APIContext) {
 		Description:               optional.Some(form.Description),
 		Website:                   optional.Some(form.Website),
 		Location:                  optional.Some(form.Location),
-		Visibility:                optional.FromNonDefault(api.VisibilityModes[form.Visibility]),
+		Visibility:                optional.FromMapLookup(api.VisibilityModes, form.Visibility),
 		RepoAdminChangeTeamAccess: optional.FromPtr(form.RepoAdminChangeTeamAccess),
 	}
 	if err := user_service.UpdateUser(ctx, ctx.Org.Organization.AsUser(), opts); err != nil {