[libcalamares] Don't log useless FUNC_INFO for Python

- When a Python module calls utils.debug(), there's no point
  in logging the C++ funcinfo that passes the parameters on;
  don't use cDebug() with its attendant magic.

src/libcalamares/PythonJobApi.cpp

@@ -148,7 +148,7 @@ check_target_env_output( const bp::list& args, const std::string& stdin, int tim
 void
 debug( const std::string& s )
 {
-    cDebug() << "[PYTHON JOB]: " << QString::fromStdString( s );
+    Logger::CDebug( Logger::LOGDEBUG ) << "[PYTHON JOB]: " << QString::fromStdString( s );
 }
 
 void