[Toybox] [PATCH] ps.c: fix typo.

[enh]

Android's new "foreground_window" cgroup uses an underscore, unlike
all the previous cgroups which used hyphens. Sadly, it's too late
to fix the inconsistency now.
---
 toys/posix/ps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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