Reverting unnecessary deletions.

Signed-off-by: silanus23 <berkantali23@outlook.com>

Author: silanus23

nav2_behavior_tree/test/plugins/action/test_bt_action_node.cpp

@@ -633,10 +633,13 @@ int main(int argc, char ** argv)
 {
   ::testing::InitGoogleTest(&argc, argv);
 
+  // initialize ROS
   rclcpp::init(argc, argv);
 
   bool all_successful = RUN_ALL_TESTS();
 
+  // shutdown ROS
   rclcpp::shutdown();
+
   return all_successful;
 }