core: do not allow edit for setting_storage

packages/hydrooj/src/handler/home.ts

@@ -223,6 +223,7 @@ class HomeSecurityHandler extends Handler {
 
 function set(s: Setting, key: string, value: any) {
     if (s) {
+        if (s.family === 'setting_storage') return undefined;
         if (s.flag & setting.FLAG_DISABLED) return undefined;
         if ((s.flag & setting.FLAG_SECRET) && !value) return undefined;
         if (s.type === 'boolean') {