[Toybox] test.sh: Don't override "C" command path in TEST_HOST if it's set

[Oliver Webb]

A mildly annoying issue of you are trying to test with different implementations of commands
such as plan9 ones or sbase or busybox ones, things with different conflicting implementations 
of things like xxd or vi. With this patch you can do "make test_cmd TEST_HOST=1 C=/path/to/other/cmd"
and have it work

-   Oliver Webb <aquahobbyist at proton.me>
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