wayland: Change the non-native fullscreen mode scaling default to 'aspect'

include/SDL3/SDL_hints.h

@@ -4037,9 +4037,8 @@ extern "C" {
  * The variable can be set to the following values:
  *
  * - "aspect" - Video modes will be displayed scaled, in their proper aspect
- *   ratio, with black bars.
+ *   ratio, with black bars. (default)
  * - "stretch" - Video modes will be scaled to fill the entire display.
- *   (default)
  * - "none" - Video modes will be displayed as 1:1 with no scaling.
  *
  * This hint should be set before creating a window.

src/video/wayland/SDL_waylandwindow.c

@@ -103,15 +103,15 @@ static enum WaylandModeScale GetModeScaleMethod(void)
         const char *scale_hint = SDL_GetHint(SDL_HINT_VIDEO_WAYLAND_MODE_SCALING);
 
         if (scale_hint) {
-            if (!SDL_strcasecmp(scale_hint, "aspect")) {
-                scale_mode = WAYLAND_MODE_SCALE_ASPECT;
+            if (!SDL_strcasecmp(scale_hint, "stretch")) {
+                scale_mode = WAYLAND_MODE_SCALE_STRETCH;
             } else if (!SDL_strcasecmp(scale_hint, "none")) {
                 scale_mode = WAYLAND_MODE_SCALE_NONE;
             } else {
-                scale_mode = WAYLAND_MODE_SCALE_STRETCH;
+                scale_mode = WAYLAND_MODE_SCALE_ASPECT;
             }
         } else {
-            scale_mode = WAYLAND_MODE_SCALE_STRETCH;
+            scale_mode = WAYLAND_MODE_SCALE_ASPECT;
         }
     }