refactor: replace defaultProps with JavaScript default parameters (#9464)

This change in specific to React components and
React@18 version.

Refs #9456

src/core/components/app.jsx

@@ -1,21 +1,24 @@
+/**
+ * @prettier
+ */
 import React from "react"
 import PropTypes from "prop-types"
 
-export default class App extends React.Component {
-
+class App extends React.Component {
   getLayout() {
-    let { getComponent, layoutSelectors } = this.props
+    const { getComponent, layoutSelectors } = this.props
     const layoutName = layoutSelectors.current()
     const Component = getComponent(layoutName, true)
-    return Component ? Component : ()=> <h1> No layout defined for &quot;{layoutName}&quot; </h1>
+
+    return Component
+      ? Component
+      : () => <h1> No layout defined for &quot;{layoutName}&quot; </h1>
   }
 
   render() {
     const Layout = this.getLayout()
 
-    return (
-      <Layout/>
-    )
+    return <Layout />
   }
 }
 
@@ -24,5 +27,4 @@ App.propTypes = {
   layoutSelectors: PropTypes.object.isRequired,
 }
 
-App.defaultProps = {
-}
+export default App