tests: fix vhangup.test
tests: fix vhangup.test

* tests/vhangup.c (main): Fix expected output for the case when
the calling process has CAP_SYS_TTY_CONFIG capability.

Reported-by: Yun-Chih Chen <8b4985fe571ef22ea1643062909f573a7d3440a1@ntu.edu.tw>

cuviper/strace,Saruta/strace,Saruta/strace,Saruta/strace,cuviper/strace,Saruta/strace,cuviper/strace,cuviper/strace,Saruta/strace,cuviper/strace