Restore handling SPACE as play-pause only in fullscreen

When not in fullscreen SPACE should be not handled by the player, and hence result in a scroll down

app/src/main/java/org/schabi/newpipe/player/Player.java

@@ -3752,10 +3752,13 @@ public final class Player implements
             default:
                 break;
             case KeyEvent.KEYCODE_SPACE:
+                if (isFullscreen) {
                     playPause();
                     if (isPlaying()) {
                         hideControls(0, 0);
                     }
+                    return true;
+                }
                 break;
             case KeyEvent.KEYCODE_BACK:
                 if (DeviceUtils.isTv(context) && isControlsVisible()) {

app/src/main/java/org/schabi/newpipe/player/playback/PlayerMediaSession.java

@@ -88,6 +88,7 @@ public class PlayerMediaSession implements MediaSessionCallback {
     @Override
     public void play() {
         player.play();
+        // hide the player controls even if the play command came from the media session
         player.hideControls(0, 0);
     }