Fix waiting for input after executing a run request in pager mode

Fix waiting for input after executing a run request in pager mode

When in pager mode, stdin should not be touched. After executing a run
request a getc(stdin) was done to wait for the user's command to
continue, which didn't result in the expected behavior. To fix this
store the proper TTY handle in the new opt_tty variable which is set up
by init_display().