Convert LoadingScreen component to use JSX (#7545)

ui/app/components/ui/loading-screen/loading-screen.component.js

@@ -1,31 +1,33 @@
-const { Component } = require('react')
-const h = require('react-hyperscript')
+import React, {Component} from 'react'
 const PropTypes = require('prop-types')
 const Spinner = require('../spinner')
 
 class LoadingScreen extends Component {
+  static defaultProps = {
+    loadingMessage: null,
+  }
+
+  static propTypes = {
+    loadingMessage: PropTypes.string,
+  }
+
   renderMessage () {
     const { loadingMessage } = this.props
-    return loadingMessage && h('span', loadingMessage)
+    return loadingMessage
+      ? <span>{loadingMessage}</span>
+      : null
   }
 
   render () {
     return (
-      h('.loading-overlay', [
-        h('.loading-overlay__container', [
-          h(Spinner, {
-            color: '#F7C06C',
-          }),
-
-          this.renderMessage(),
-        ]),
-      ])
+      <div className="loading-overlay">
+        <div className="loading-overlay__container">
+          <Spinner color="#F7C06C" />
+          {this.renderMessage()}
+        </div>
+      </div>
     )
   }
 }
 
-LoadingScreen.propTypes = {
-  loadingMessage: PropTypes.string,
-}
-
 module.exports = LoadingScreen