wayland: Don't query the cursor info with DBus if the cursor shape protocol is present

If the cursor shape protocol is supported, the compositor will handle cursor themes and sizes automatically, so querying the properties with DBus serves no purpose as the values are never used.

src/video/wayland/SDL_waylandmouse.c

@@ -578,7 +578,7 @@ static SDL_Cursor *Wayland_CreateSystemCursor(SDL_SystemCursor id)
         /* The surface is only necessary if the cursor shape manager is not present.
          *
          * Note that we can't actually set any other cursor properties, as this
-         * is output-specific. See wayland_get_system_cursor for the rest!
+         * is window-specific. See Wayland_GetSystemCursor for the rest!
          */
         if (!data->cursor_shape_manager) {
             cdata->surface = wl_compositor_create_surface(data->compositor);
@@ -1013,7 +1013,12 @@ void Wayland_InitMouse(void)
     }
 
 #ifdef SDL_USE_LIBDBUS
-    Wayland_DBusInitCursorProperties(d);
+    /* The DBus cursor properties are only needed when manually loading themes and cursors.
+     * If the cursor shape protocol is present, the compositor will handle it internally.
+     */
+    if (!d->cursor_shape_manager) {
+        Wayland_DBusInitCursorProperties(d);
+    }
 #endif
 
     SDL_SetDefaultCursor(Wayland_CreateDefaultCursor());