fixed a freeze on emu shutdown in windows build

Source/Plugins/Plugin_VideoDX9/Src/main.cpp

@@ -78,7 +78,7 @@ void VideoBackend::UpdateFPSDisplay(const char *text)
 {
 	TCHAR temp[512];
 	swprintf_s(temp, sizeof(temp)/sizeof(TCHAR), _T("%hs | DX9 | %hs"), scm_rev_str, text);
-	SetWindowText(EmuWindow::GetWnd(), temp);
+	EmuWindow::SetWindowText(temp);
 }
 
 std::string VideoBackend::GetName()