[Toybox] [PATCH] killall.test, pidof.test: deflake.

[enh]

Rarely (but these tests now get run often), it seems like we catch the
shell between its fork and exec of sleep, which counts as false
positives for killall/pidof. Since we don't actually need to sleep, just
have the shell script spin instead.
---
 tests/killall.test | 2 +-
 tests/pidof.test   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
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