[Toybox] [PATCH 1/2] killall.test: fix flakiness.

[enh]

And when I say "fix", I mean "hack around in the worst possible way".

Android+mksh is often slow enough that we can do the pgrep before the
killed process has actually exited. (I'm seeing roughly 100% failure
rate on cloud x86 emulators, and about 75% on a real Pixel 2.)
---
 tests/killall.test | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)
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