Fixed circular dependencies

Summary: Fixed circular dependency warnings and removed some dead code while at it.

Reviewed By: jknoxville

Differential Revision: D20557313

fbshipit-source-id: 856c42113a9abe36d3e14f9d538eb40705ceb87f

desktop/app/src/ui/components/elements-inspector/Visualizer.tsx

@@ -9,7 +9,8 @@
 
 import React from 'react';
 import ReactDOM from 'react-dom';
-import {Element, styled} from '../../../ui';
+import {Element} from './ElementsInspector';
+import styled from '@emotion/styled';
 
 export function VisualizerPortal(props: {
   container: HTMLElement;