Greatly reduce repeated code

functions/api/events-team/events/_middleware.ts

@@ -1,15 +1,12 @@
+import { jsonError } from "../../../common.js";
+
 export async function onRequest(context: RequestContext) {
   if (
     ![1 << 3, 1 << 4, 1 << 12].find(
       (int) => context.data.current_user?.permissions & int,
     )
   )
-    return new Response('{"error":"Forbidden"}', {
-      headers: {
-        "content-type": "application/json",
-      },
-      status: 401,
-    });
+    return jsonError("Forbidden", 403);
 
   return await context.next();
 }