Add progressInterval logic back in to onProgress

progressInterval change was not moved to Player component in 42a030e6cfa721eb15c6af2b27c828160ebcae25
Fixes cookpete/react-player#339

src/Player.js

@@ -89,7 +89,7 @@ export default class Player extends Component {
         this.prevLoaded = progress.loaded
       }
     }
-    this.progressTimeout = setTimeout(this.progress, this.props.progressFrequency)
+    this.progressTimeout = setTimeout(this.progress, this.props.progressFrequency || this.props.progressInterval)
   }
   seekTo (amount) {
     // When seeking before player is ready, store value and seek later