starter_video.cpp changed CV WINDOW KEEPRATIO to just WINDOW KEEPTATIO to fix build error

samples/cpp/starter_video.cpp

@@ -37,7 +37,7 @@ int process(VideoCapture& capture) {
     char filename[200];
     string window_name = "video | q or esc to quit";
     cout << "press space to save a picture. q or esc to quit" << endl;
-    namedWindow(window_name, CV_WINDOW_KEEPRATIO); //resizable window;
+    namedWindow(window_name, WINDOW_KEEPRATIO); //resizable window;
     Mat frame;
     
     for (;;) {