Don't lowercase UrlBase in ConfigFileProvider

UrlBase should honour the case it is given.

src/NzbDrone.Core/Configuration/ConfigFileProvider.cs

@@ -203,7 +203,7 @@ namespace NzbDrone.Core.Configuration
                     return urlBase;
                 }
 
-                return "/" + urlBase.Trim('/').ToLower();
+                return "/" + urlBase;
             }
         }