Update Fanart commented-out API key to our own

MediaBrowser.Providers/Movies/FanartMovieImageProvider.cs

@@ -37,7 +37,6 @@ namespace MediaBrowser.Providers.Movies
         private readonly IJsonSerializer _json;
 
         private const string FanArtBaseUrl = "https://webservice.fanart.tv/v3/movies/{1}?api_key={0}";
-        // &client_key=52c813aa7b8c8b3bb87f4797532a2f8c
 
         internal static FanartMovieImageProvider Current;
 

MediaBrowser.Providers/TV/FanArt/FanartSeriesProvider.cs

@@ -36,7 +36,6 @@ namespace MediaBrowser.Providers.TV
         private readonly IJsonSerializer _json;
 
         private const string FanArtBaseUrl = "https://webservice.fanart.tv/v3/tv/{1}?api_key={0}";
-        // &client_key=52c813aa7b8c8b3bb87f4797532a2f8c
 
         internal static FanartSeriesProvider Current { get; private set; }