RTEMS | libmisc/shell: Only restore terminal settings on exit when captured (!300)

[Chris Johns (@chris)]

Chris Johns commented on a discussion on cpukit/libmisc/shell/shell.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/300#note_114748

 >    struct termios  previous_term;
 >    bool            result;
 >    bool            interactive = true;
 > +  int             tc_result;

And called `have_previous_term` so it tracks the state of the `previous_term` data.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/300#note_114748
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