remove fixed todo

src/Umbraco.Web.UI.Client/src/backoffice/backoffice.element.ts

@@ -20,18 +20,9 @@ export class UmbBackoffice extends LitElement {
         font-size: 14px;
         box-sizing: border-box;
       }
-
-      #main {
-        display: flex;
-        flex: 1;
-        overflow: hidden;
-      }
     `,
   ];
 
-  // TODO: main div and then side and main again within? I propose the backoffice-main begin renamed to something less main-ish.
-  // TODO: I would think umb-backoffice-header would be outside the router outlet? so its always present.
-
   render() {
     return html`
       <umb-backoffice-header></umb-backoffice-header>