Allow 01-joystick-polling example to be resizable

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

examples/input/01-joystick-polling/joystick-polling.c

@@ -41,7 +41,7 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
         return SDL_APP_FAILURE;
     }
 
-    if (!SDL_CreateWindowAndRenderer("examples/input/joystick-polling", 640, 480, 0, &window, &renderer)) {
+    if (!SDL_CreateWindowAndRenderer("examples/input/joystick-polling", 640, 480, SDL_WINDOW_RESIZABLE, &window, &renderer)) {
         SDL_Log("Couldn't create window/renderer: %s", SDL_GetError());
         return SDL_APP_FAILURE;
     }