RTEMS | Only restore terminal settings on exit when it can (!300)

[yang zhang (@yang.zhang)]

yang zhang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/300

Project:Branches: yang.zhang/rtems:shell_terminal to rtems/rtos/rtems:main
Author:   yang zhang




## Summary

Only restore terminal settings on exit when it can

Signed-off-by: yang.zhang <zhangyang01 at kylinos.cn>


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