Fix #113653: Compositor superfluously executes on scene changes

The compositor executes superfluously on scene changes when adding or
removing objects.

This was due to an explicit handling of a certain notifier, which was
introduced in commit 1e948b251d. The exact reasoning behind the
addition is unknown, so this patch removes it until we have an informed
decision to keep it.

source/blender/editors/space_node/space_node.cc

@@ -562,9 +562,6 @@ static void node_area_listener(const wmSpaceTypeListenerParams *params)
         case ND_TRANSFORM_DONE:
           node_area_tag_recalc_auto_compositing(snode, area);
           break;
-        case ND_LAYER_CONTENT:
-          node_area_tag_tree_recalc(snode, area);
-          break;
       }
       break;