Issue 4486 - fix document URL parameter value when calling GetWhitelistingFilter

src/engine/Main.cpp

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 91 matching lines @@
       return match->GetProperty("text")->AsString();
     }
     return "";
   };
 
   std::string GetWhitelistingFilter(const std::string& urlArg,
     const std::vector<std::string>& frameHierarchy, AdblockPlus::FilterEngine::ContentType type)
   {
     if (frameHierarchy.empty())
     {
-      return GetWhitelistingFilter(urlArg, "", type);
+      return GetWhitelistingFilter(urlArg, urlArg, type);
     }
     auto frameIterator = frameHierarchy.begin();
     std::string url = urlArg;
     do
     {
       std::string parentUrl = *frameIterator++;
       auto filterText = GetWhitelistingFilter(url, parentUrl, type);
       if (!filterText.empty())
       {
         return filterText;
@@ skipping 633 matching lines @@
   });
 
   int retValue = _AtlModule.WinMain(cmdShow);
   if (communicationThread.joinable())
   {
     communicationThread.join();
   }
 
   return retValue;
 }