Inspector: Don't show child count in remote object tree

You can just open a node if you want to see its children.

DevTools/Inspector/RemoteObjectGraphModel.cpp

@@ -106,7 +106,7 @@ GUI::Variant RemoteObjectGraphModel::data(const GUI::ModelIndex& index, Role rol
         return m_object_icon;
     }
     if (role == Role::Display) {
-        return String::format("%s{%s} (%d)", remote_object->class_name.characters(), remote_object->address.characters(), remote_object->children.size());
+        return String::format("%s{%s}", remote_object->class_name.characters(), remote_object->address.characters());
     }
     return {};
 }