[Toybox] [PATCH] Fix pgrep -s 0 when running in session ID 0

[Colin Cross]

I came across an issue when running the pgrep -s 0 test in Android's
CI infrastructure that uses a PID namespace, causing the test to run
session ID 0:

$ sudo unshare -fp ./toybox pgrep -s 0
pgrep: bad -s '0'

The attached patch fixes the argument parsing to support getsid returning 0.
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