Inconsistency in slam params naming

[sskorol]

slam.launch.py currently has 2 inconsistent params that describe the same config:

• https://github.com/luxonis/rae-ros/blob/humble/rae_bringup/launch/slam.launch.py#L13
• https://github.com/luxonis/rae-ros/blob/humble/rae_bringup/launch/slam.launch.py#L81

This causes an exception during bringup. Both entries should be the same: either slam_params_file or params_file.