Reset rawInputEnableCount when RawInput is not supported

src/video/windows/SDL_windowsmouse.c

@@ -57,6 +57,9 @@ ToggleRawInput(SDL_bool enabled)
 
     /* (Un)register raw input for mice */
     if (RegisterRawInputDevices(&rawMouse, 1, sizeof(RAWINPUTDEVICE)) == FALSE) {
+        /* Reset the enable count, otherwise subsequent enable calls will
+           believe raw input is enabled */
+        rawInputEnableCount = 0;
 
         /* Only return an error when registering. If we unregister and fail,
            then it's probably that we unregistered twice. That's OK. */