Don't draw player when in background

Model/Player/PlayerModel.swift

@@ -446,6 +446,8 @@ final class PlayerModel: ObservableObject {
         }
     #else
         func handleEnterForeground() {
+            setNeedsDrawing(true)
+
             guard closePiPAndOpenPlayerOnEnteringForeground, playingInPictureInPicture else {
                 return
             }
@@ -454,6 +456,10 @@ final class PlayerModel: ObservableObject {
             closePiP()
         }
 
+        func handleEnterBackground() {
+            setNeedsDrawing(false)
+        }
+
         func enterFullScreen() {
             guard !controls.playingFullscreen else {
                 return