Revert "Fix: don't set default value for unused socket in geometry nodes"

This reverts commit 154d3e95f8.

This caused crashes in the mouse house and flower shop benchmark files.
A proper solution will be investigated soon.

source/blender/nodes/geometry/nodes/node_geo_attribute_capture.cc

@@ -147,6 +147,7 @@ static void node_geo_exec(GeoNodeExecParams params)
 
   if (!attribute_id) {
     params.set_output("Geometry", geometry_set);
+    params.set_default_remaining_outputs();
     return;
   }