Don't show an X cursor when closing an Xwayland window or with certain dropdowns.
Based on https://github.com/djpohly/dwl/pull/32
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/* Set the default XWayland cursor to match the rest of dwl. */
struct wlr_xcursor *xcursor = wlr_xcursor_manager_get_xcursor(cursor_mgr, "left_ptr", 1);
wlr_xwayland_set_cursor(xwayland,
xcursor->images[0]->buffer, xcursor->images[0]->width * 4,
xcursor->images[0]->width, xcursor->images[0]->height,
xcursor->images[0]->hotspot_x, xcursor->images[0]->hotspot_y);