WINDOWS: Change location where screenshot are saved

This fixes bug #9701: WINDOWS: Flow of taking screenshots
on Windows is broken

backends/platform/sdl/sdl.cpp

@@ -571,6 +571,11 @@ Common::SaveFileManager *OSystem_SDL::getSavefileManager() {
 #endif
 }
 
+//Not specified in base class
+Common::String OSystem_SDL::getScreenshotsPath() {
+	return Common::String();
+}
+
 #ifdef USE_OPENGL
 
 const OSystem::GraphicsMode *OSystem_SDL::getSupportedGraphicsModes() const {