Fixed a mistake

The Papyrus compiler's error stream was mistakenly being sent to the
output stream of the wrapper rather than the error stream, but that has
now been corrected.

Author: Kapiainen

Advanced Papyrus.cs

@@ -166,7 +166,7 @@ static void RunCompiler(string[] args)
         };
         proc.EnableRaisingEvents = true;
         proc.OutputDataReceived += new DataReceivedEventHandler(OutputWriter);
-        proc.ErrorDataReceived += new DataReceivedEventHandler(OutputWriter);
+        proc.ErrorDataReceived += new DataReceivedEventHandler(ErrorWriter);
         proc.Start();
         proc.BeginOutputReadLine();
         proc.BeginErrorReadLine();