Refactor: convert initializeApp to func component and use JSX transform in the codebase (#4056)

src/actions/actionDeleteSelected.tsx

@@ -1,7 +1,6 @@
 import { isSomeElementSelected } from "../scene";
 import { KEYS } from "../keys";
 import { ToolButton } from "../components/ToolButton";
-import React from "react";
 import { trash } from "../components/icons";
 import { t } from "../i18n";
 import { register } from "./register";