Fix #142377: Grease Pencil SVG Exporter objects disabled in render

This adds a check to ensure that objects disable in the render
don't show up in exported SVGs.

4.5 Backport candidate.

Pull Request: https://projects.blender.org/blender/blender/pulls/147332

source/blender/io/grease_pencil/intern/grease_pencil_io.cc

@@ -351,7 +351,9 @@ Vector<GreasePencilExporter::ObjectInfo> GreasePencilExporter::retrieve_objects(
       break;
     case SelectMode::Visible:
       LISTBASE_FOREACH (Base *, base, BKE_view_layer_object_bases_get(view_layer)) {
-        add_object(base->object);
+        if ((base->flag & BASE_ENABLED_RENDER) != 0) {
+          add_object(base->object);
+        }
       }
       break;
   }