VLCPlaybackInfoSubtitlesFetcherViewController: tvOS 11 apperance fix

(cherry picked from commit c8cd12295874cc181f5ac0d9c11ec6156fb2f00e)

Apple-TV/Playback/Playback Info/VLCPlaybackInfoSubtitlesFetcherViewController.m

@@ -31,6 +31,7 @@
     [super viewDidLoad];
 
     self.titleLabel.text = self.title;
+    self.tableView.backgroundColor = [UIColor clearColor];
 
     _osoFetcher = [[MDFOSOFetcher alloc] init];
     _osoFetcher.userAgentKey = @"VLSub 0.9";