Add fix to strip the single quotes while using --controller-ros-args

[saikishor]

With the changes introduced in #1713. When updating the demos, if we encapsulate the args into single quotes, then it seems not to work.

We cannot leave single quotes in the launch description, as it complains for pre-commit. The proposed changes should handle both the cases

[christophfroehlich]

I'm not sure why we need the single quotes in
"'--ros-args -r /bicycle_steering_controller/tf_odometry:=/tf'",
this

    robot_bicycle_controller_spawner = Node(
        package="controller_manager",
        executable="spawner",
        arguments=[
            'bicycle_steering_controller',
            '--param-file',
            robot_controllers,
            '--controller-ros-args',
            '--ros-args -r /bicycle_steering_controller/tf_odometry:=/tf',
        ],
    )

works as well as

    robot_bicycle_controller_spawner = Node(
        package="controller_manager",
        executable="spawner",
        arguments=[
            "bicycle_steering_controller",
            "--param-file",
            robot_controllers,
            "--controller-ros-args",
            "--ros-args -r /bicycle_steering_controller/tf_odometry:=/tf",
        ],
    )

without the changes of this PR.

[saikishor]

@christophfroehlich You are totally right. It should be probably due to some local changes