Remove scrolling workaround for Windows 10

The bug was caused by Windows not considering the leftmost or bottommost pixel part of the window in fullscreen mode. We now always grab the mouse in fullscreen mode, so the mouse never leaves the window.

Author: bvschaik

src/input/scroll.c

@@ -335,11 +335,6 @@ static int get_direction(const mouse *m)
     int is_inside_window = m->is_inside_window;
     int width = screen_width();
     int height = screen_height();
-    if (setting_fullscreen() && m->x < width && m->y < height) {
-        // For Windows 10, in fullscreen mode, on HiDPI screens, this is needed
-        // to get scrolling to work
-        is_inside_window = 1;
-    }
     if (!is_inside_window && !m->is_touch) {
         return DIR_8_NONE;
     }