wayland: fix vertical resize

The calculation was only implemented for horizontal resize,
now it works with vertical resize as well.

video/out/wayland_common.c

@@ -918,10 +918,18 @@ static void handle_toplevel_config(void *data, struct xdg_toplevel *toplevel,
 
     if (!is_fullscreen && !is_maximized) {
         if (vo_opts->keepaspect) {
-            double scale_factor = (double)width / wl->reduced_width;
-            width = ceil(wl->reduced_width * scale_factor);
-            if (vo_opts->keepaspect_window)
-                height = ceil(wl->reduced_height * scale_factor);
+            const double sf_w = (double)width / wl->reduced_width;
+            const double sf_h = (double)height / wl->reduced_height;
+            const bool horizontal = sf_w > sf_h;
+            const double scale_factor = horizontal ? sf_w : sf_h;
+            int *const resized_dimension = horizontal ? &width : &height;
+            int *const not_resized_dimension = horizontal ? &height : &width;
+            int *red_rd = horizontal ? &wl->reduced_width : &wl->reduced_height;
+            int *red_nrd = horizontal ? &wl->reduced_height : &wl->reduced_width;
+            *resized_dimension = ceil(*red_rd * scale_factor);
+            if (vo_opts->keepaspect_window) {
+                *not_resized_dimension = ceil(*red_nrd * scale_factor);
+            }
         }
         wl->window_size.x0 = 0;
         wl->window_size.y0 = 0;