Change flow syntax

app/features/app/components/App.js

@@ -8,7 +8,7 @@ import config from '../../config';
 /**
  * Main component encapsulating the entire application.
  */
-export default class App extends Component<{}> {
+export default class App extends Component<*> {
     /**
      * Initializes a new {@code App} instance.
      *

app/features/conference/components/Conference.js

@@ -14,9 +14,9 @@ import {
 import config from '../../config';
 
 /**
- * Jitsi Meet Window Component
+ * Conference component.
  */
-export default class Conference extends Component<{}> {
+export default class Conference extends Component<*> {
     /**
      * Attach the script
      */