[Toybox] [PATCH] pidof.test: block on sleep rather than read.

[enh]

The commit that added the read mentioned the killall tests, but they use
sleep. Blocking on a read of stdout is failing in some of the Android
test infrastructure where it seems to end up connected to a socket.

  ./pidof-12488.test[2]: can't open /proc/self/fd/1: No such device or address

(Unfortunately I haven't been able to reproduce this locally, or even on
a cloud instance. It seems to only happen in the test infrastructure,
but it's 100% reproduceable there.)
---
 tests/pidof.test | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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