Make Tvdb strings const

MediaBrowser.Providers/TV/TheTVDB/TvdbUtils.cs

@@ -5,9 +5,9 @@ namespace MediaBrowser.Providers.TV.TheTVDB
 {
     public static class TvdbUtils
     {
-        public static readonly string TvdbApiKey = "OG4V3YJ3FAP7FP2K";
-        public static readonly string TvdbBaseUrl = "https://www.thetvdb.com/";
-        public static readonly string BannerUrl = TvdbBaseUrl + "banners/";
+        public const string TvdbApiKey = "OG4V3YJ3FAP7FP2K";
+        public const string TvdbBaseUrl = "https://www.thetvdb.com/";
+        public const string BannerUrl = TvdbBaseUrl + "banners/";
 
         public static ImageType GetImageTypeFromKeyType(string keyType)
         {

MediaBrowser.Providers/TV/TvExternalIds.cs

@@ -25,7 +25,7 @@ namespace MediaBrowser.Providers.TV
 
         public string Key => MetadataProviders.Tvdb.ToString();
 
-        public string UrlFormatString => "https://thetvdb.com/?tab=series&id={0}";
+        public string UrlFormatString => TvdbUtils.TvdbBaseUrl + "?tab=series&id={0}";
 
         public bool Supports(IHasProviderIds item)
         {
@@ -53,7 +53,7 @@ namespace MediaBrowser.Providers.TV
 
         public string Key => MetadataProviders.Tvdb.ToString();
 
-        public string UrlFormatString => "https://thetvdb.com/?tab=episode&id={0}";
+        public string UrlFormatString => TvdbUtils.TvdbBaseUrl + "?tab=episode&id={0}";
 
         public bool Supports(IHasProviderIds item)
         {