[Toybox] [PATCH] top: fix -b.

[enh]

We hadn't updated the output in -b mode ever since I broke this in 2016.

Bug: http://b/126347053 "top doesn't seem to update the output when run in
batch mode (-b)"
---
 toys/posix/ps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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