Remove ErrorDialog.h from .h files (one function moves out of line)

src/prefs/DevicePrefs.cpp

@@ -30,6 +30,7 @@ other settings.
 #include <wx/choice.h>
 #include <wx/intl.h>
 #include <wx/log.h>
+#include <wx/textctrl.h>
 
 #include "portaudio.h"
 

src/prefs/QualityPrefs.cpp

@@ -20,6 +20,7 @@
 
 #include <wx/choice.h>
 #include <wx/defs.h>
+#include <wx/textctrl.h>
 
 #include "../AudioIO.h"
 #include "../Dither.h"