Kill FrameMain::HasASSDraw as it's no longer used

Originally committed to SVN as r5555.

aegisub/src/frame_main.cpp

@@ -574,15 +574,6 @@ bool FrameMain::LoadList(wxArrayString list) {
 	return subs.size() || audio.size() || video.size();
 }
 
-bool FrameMain::HasASSDraw() {
-#ifdef __WINDOWS__
-	wxFileName fn(StandardPaths::DecodePath("?data/ASSDraw3.exe"));
-	return fn.FileExists();
-#else
-	return false;
-#endif
-}
-
 static void autosave_timer_changed(wxTimer *timer, const agi::OptionValue &opt) {
 	int freq = opt.GetInt();
 	if (freq <= 0) {

aegisub/src/frame_main.h

@@ -141,8 +141,6 @@ public:
 	FrameMain(wxArrayString args);
 	~FrameMain();
 
-	bool HasASSDraw();
-
 	/// Set the status bar text
 	/// @param text New status bar text
 	/// @param ms Time in milliseconds that the message should be visible