[Map] Specify "renderer" option, even if empty

Author: Kocal

symfony/ux-map/2.19/config/packages/ux_map.yaml

@@ -1,3 +1,3 @@
 ux_map:
     # https://symfony.com/bundles/ux-map/current/index.html#available-renderers
-    # renderer: '%env(UX_MAP_DSN)%'
+    renderer: '%env(default::UX_MAP_DSN)%'