Modal functions.

app/js/main.js

 import EventWindow from "/app/js/ui/EventWindow.js";
+import Modal from "/app/js/ui/Modal.js";
 import {NESPainter} from "/app/js/NESPainter.js";
 import {NESPalette} from "/app/js/NESPalette.js";
 

app/js/ui/Modal.js

     if (el.classList.contains("modal")){
       if (this.__currentModalEl !== null && force)
         this.close_modal();
-      if this.__currentModalEl === null){
+      if (this.__currentModalEl === null){
         el.classList.add("modal-visible");
         this.__currentModalEl = el;
       }
 
 
 const instance = new Modal();
-Object.freeze(instance);
 export default instance;