URL-encode spaces as %20 in picon HTTP request URLs

When fetching picons from the web interface, channel names containing
spaces were used as-is in the HTTP URL, causing 400 Bad Request errors.

URL-encode spaces as %20 in both code paths:
- Channel::CreateIconPath() (UseOnlinePicons without OpenWebIf path)
- Channels::LoadChannelsExtraData() (UseOpenWebIfPiconPath)

Author: mapi68

src/enigma2/Channels.cpp

@@ -345,7 +345,9 @@ int Channels::LoadChannelsExtraData(const std::shared_ptr<enigma2::data::Channel
               {
                 std::string connectionURL = m_settings->GetConnectionURL();
                 connectionURL = connectionURL.substr(0, connectionURL.size() - 1);
-                channel->SetIconPath(StringUtils::Format("%s%s", connectionURL.c_str(), jsonChannel["picon"].get<std::string>().c_str()));
+                std::string piconPath = jsonChannel["picon"].get<std::string>();
+                StringUtils::Replace(piconPath, " ", "%20");
+                channel->SetIconPath(StringUtils::Format("%s%s", connectionURL.c_str(), piconPath.c_str()));
 
                 Logger::Log(LEVEL_DEBUG, "%s For Channel %s, using OpenWebPiconPath: %s", __func__, jsonChannel["servicename"].get<std::string>().c_str(), channel->GetIconPath().c_str());
               }

src/enigma2/data/Channel.cpp

@@ -181,7 +181,11 @@ std::string Channel::CreateIconPath(const std::string& commonServiceReference)
   std::replace(iconPath.begin(), iconPath.end(), ':', '_');
 
   if (m_settings->UseOnlinePicons())
-    iconPath = StringUtils::Format("%spicon/%s.png", m_settings->GetConnectionURL().c_str(), iconPath.c_str());
+  {
+    std::string encodedPath = iconPath;
+    StringUtils::Replace(encodedPath, " ", "%20");
+    iconPath = StringUtils::Format("%spicon/%s.png", m_settings->GetConnectionURL().c_str(), encodedPath.c_str());
+  }
   else
     iconPath = m_settings->GetIconPath().c_str() + iconPath + ".png";