[Toybox] [PATCH] crond: Fix timing

[Kana Steimle]

The changes are working fine for me so far. But after trying more
things with crond, I found a few more issues I wanted to fix, all
related to environment variables. Another patch is attached.
- When setting a variable in the crontab file, the value would have a
newline at the end of it. That's because getline() returns the line
with a newline at the end, and the code didn't strip that newline out.
- The HOME variable was being sourced from what HOME was set to when
crond was run, rather than what the user's home is in the passwd file.
I believe the intention was to set HOME to what it is in the passwd
file, but allow the crontab to override it.
- I decided to also set LOGNAME to the username of the crontab's
owner, since the posix manpage for crontab mentions that as one of the
variables that should be set.
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