logging: Fix cerr/cout according to level

Previously the logging level was reversed for adding a None level,
but the selection of cerr or cout was not reversed. Fix that.

Author: xlz

src/logging.cpp

@@ -117,7 +117,7 @@ class ConsoleLogger : public Logger
   {
     if(level > level_) return;
 
-    (level >= Warning ? std::cerr : std::cout) << "[" << level2str(level) << "] " << message << std::endl;
+    (level <= Warning ? std::cerr : std::cout) << "[" << level2str(level) << "] " << message << std::endl;
   }
 };