Change default to Tracing to File

I used to recommend circular buffer tracing - and it is excellent - but
it seems to be harder for people to use to get good results. I keep
telling people to change the setting, so now I'm just changing the
default.

UIforETW/UIforETWDlg.h

@@ -106,7 +106,7 @@ class CUIforETWDlg : public CDialog
 	CComboBox btInputTracing_;
 	CStatic btInputTracingLabel_;
 
-	TracingMode tracingMode_ = kTracingToMemory;
+	TracingMode tracingMode_ = kTracingToFile;
 	// Increase the buffer count by some proportion when tracing to a file
 	// on a large-memory machine.
 	int BufferCountBoost(int requestCount) const noexcept;