Automatically acknowledge after /toggle_grip

This should avoid that users need to do that in between calls to
/toggle_grip.

schunk_egu_egk_gripper_driver/src/schunk_gripper_wrapper.cpp

@@ -1819,6 +1819,7 @@ void SchunkGripperNode::toggle_grip_srv(const std::shared_ptr<std_srvs::srv::Tri
         RCLCPP_WARN(this->get_logger(),"COMMAND FAILED");
         res->success = false;
     }
+    acknowledge();
     last_command = 0;
     gripper_updater->force_update();
     finishedCommand();