Minor cleaning

src/pages/admin/EventCreatePage.tsx

@@ -1,15 +1,12 @@
 import React from "react";
 import { Helmet } from "react-helmet";
 import "./EventCreatePage.scss";
-import { isAuthenticated } from "@utils/auth";
 import Form from "react-jsonschema-form";
 import { Tag, getTags } from "@models/Tag";
 import { SignupForm, getForms } from "@models/SignupForm";
 import { createEvent, getEvent, updateEvent, Event } from "@models/Event";
 import DatetimeWidget from "@components/DatetimeWidget";
 import SectionDividerWidget from "@components/SectionDividerWidget";
-import Icon from "@components/Icon";
-import { IconType } from "@components/Icon/Icon";
 
 const widgets = {
   datetime: DatetimeWidget,

src/pages/admin/SignupCreatePage.tsx

@@ -136,7 +136,7 @@ class SignupCreatePage extends React.Component<SignupCreatePageProps, SignupCrea
           default: false,
         },
         quota: {
-          type: ["integer"],
+          type: "integer",
           title: "Quota",
           minimum: 0,
           default: 0,