meta/stage: Replace \r\n with \n

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4093>

src/backends/meta-stage.c

@@ -337,7 +337,7 @@ meta_stage_new (MetaBackend *backend)
 
   stage = g_object_new (META_TYPE_STAGE,
                         "context", meta_backend_get_clutter_context (backend),
-                        "accessible-name", "Main stage",
+                        "accessible-name", "Main stage",
                         NULL);
   stage->backend = backend;